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 Post subject: Century C93 New Project
PostPosted: Sun Mar 06, 2011 11:17 am 
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Picked up a Century C93 yesterday for my new project gun.
I know Century is a crap company with a hit or miss rep.
I've heard mixed reviews on this one, equally good and bad, and decided to pick one up to see if I can make it a decent shooter.

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Picked this one for about 500 bucks (450 for the rifle and 50 in FFL fees/shipping).
Beats paying 1500 for a vector or 2500 for the real deal.
This rifle did not redeem Century's rep.

Out of the box it was rusty inside and out.
The action was stiff and the rifle hard to cycle.
The buttstock pin hole was out of round. I had to use a punch and hammer to get the pin out and the buttstock off.
The insides was full of grease and carbon on top of the rust.

The rifle came with a Bayonet, but no adaptor. No point in having it.
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Most importantly the rollers were sticking keeping the bolt head from charging fully.
This made measuring the bolt gap impossible.
So I'm going to have to take apart the bolt head, clean the rollers, reassemble, measure, and then hope the spacing is still in spec.
Pain in the ass and adding extra steps.

Overall, I'm happy with the purchase. Its a project, but not an over whelming project.
After some cleaning, tinkering, and parts searching I think I can make this into a decent shooting rifle.


Last edited by Rick Shaw on Sun Mar 06, 2011 11:31 am, edited 1 time in total.

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PostPosted: Sun Mar 06, 2011 11:29 am 
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I believe you can buy HK replacement parts and put in for far better performance and reliability. Nice buy! I was looking at getting one down the road.


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PostPosted: Sun Mar 06, 2011 11:52 am 
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st1tcher wrote:
I believe you can buy HK replacement parts and put in for far better performance and reliability. Nice buy! I was looking at getting one down the road.


HK parts are more than likely going to be the only option.
I normally deal with these two sites when looking for parts for HK or HK clones
http://www.robertrtg.com/hk93.html

http://www.hkparts.net/shop/pc/HK-93-53-Parts-c8.htm

I normally go to Robert first. Then HK parts
They have a lot in stock and the prices are decent of HK parts.


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PostPosted: Sun Mar 06, 2011 3:12 pm 
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After an hour or so of cleaning, disassembly, and assembly; I think this will be a good project.

Got the carbon, grease and rust out of the internals.
Coated everything with Gun Grease
Now the action is smoother and the rounds are cycling nicely.
Recoil Spring and guide rod are rusted to hell, but functioning.

All the internal parts have matching serial numbers which is surpriseing.
The head space is still unmeasurable. The rollers are total junk and the bolt head won't go into battery.
Ideally I would want to order +2 rollers just in case, but everyone is sold out.

I got a set of standard and +4 on order. Once the head space is in specs, I'll take her out for a test fire before I dump anymore money in it.

One thing I'm buying right now; 40 round mags
Midway USA is selling them for 20 bucks a piece.
Cheapest I've seen them in a while.


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PostPosted: Sun Mar 06, 2011 3:34 pm 
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Sweet, tagged to see how this turns out.


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PostPosted: Sun Mar 06, 2011 3:36 pm 
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Neat rifles, I wouldn't mind having one. I'll be watching to see how this project turns out.

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PostPosted: Sun Mar 06, 2011 11:41 pm 
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Wow, seems like their quality went way down. I picked mine up after seeing an LT I know at the rod and gun club nailing targets like gangbusters, and mine shoots just as good. He went on to win a Postal Match with his on the MF forums.


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PostPosted: Mon Mar 07, 2011 3:53 pm 
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Gonna track this thread .

Sounds like a lot of work so far .

I too was pretty tempted when I saw these selling in the $500 range. Always thought they were cool rifles. :D

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PostPosted: Mon Mar 07, 2011 9:44 pm 
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Was this gun bought new or used? Allot of century builds have original HK internals already.

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PostPosted: Tue Mar 08, 2011 7:02 pm 
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The rifle was bought new. The serial numbers match so I'm guessing it is still the orginal parts.
From what I read and understand,please correct me if I'm wrong, Century is useing Surplus HK parts and kits.
However, the main problem is the rifles are being slapped together leaving the head space out of spec which is throwing off the timing.

I installed the +4 rollers today and the head space is .2
I beleive the tolerence is between .1 and .2.
I'm at the upper end of the tolerence, but after some shooting and wear I should settle around .18 or so.

A side concern is that the bolt head had been ground down, which will give me a false measure for head space.
But, I think because it was bought new this shouldn't be a problem.

So far the project cost is low
14 dollars for +4 rollers
60 dollars for 3 40 round mags
500 for the rifle.
1 hour worth of cleaning and tinkering.

I hope to test fire this week sometime


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PostPosted: Tue Mar 08, 2011 10:06 pm 
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If you go let us know how well she shoots.


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PostPosted: Tue Mar 08, 2011 10:27 pm 
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FYI; Century builds the C93s out of demilled Malaysian HK33s. They use US made 1:9 barrels made by a few different manufacturers. Earlier builds had a Navy SEF lower however the latter models have a US made lower housing (discernible by the texturing on the grip). All internals otherwise come from the kits.
.


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PostPosted: Wed Mar 09, 2011 6:11 pm 
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Arkane wrote:
FYI; Century builds the C93s out of demilled Malaysian HK33s. They use US made 1:9 barrels made by a few different manufacturers. Earlier builds had a Navy SEF lower however the latter models have a US made lower housing (discernible by the texturing on the grip). All internals otherwise come from the kits.
.


Mine is an earlier build than because it has the navy lower.


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PostPosted: Wed Mar 09, 2011 8:38 pm 
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Rick Shaw wrote:
Arkane wrote:
FYI; Century builds the C93s out of demilled Malaysian HK33s. They use US made 1:9 barrels made by a few different manufacturers. Earlier builds had a Navy SEF lower however the latter models have a US made lower housing (discernible by the texturing on the grip). All internals otherwise come from the kits.
.


Mine is an earlier build than because it has the navy lower.



Actually based on the pic up top you have the latter build which uses a US made clone of the Navy lower. Here's a shot of mine (bought right after they hit market) - notice the lack of texturing on the pistol grip?

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PostPosted: Sun Mar 13, 2011 12:10 am 
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Went ahead and mounted a UTG low profile scope mount and BSA reddot on the C93.
The mount was about 20 bucks and the reddot was left over from another project,

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Took it to the range and got some good results

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25 meter unsupported rapid fire. 20 rounds (4 inch radius group)

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25 meter unsupported rapid fire. 20 rounds (4 inch radius group)

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25 meter unsupported fast fire (mag dump). 40 rounds.

I put 80 rounds of silver bear soft tip without a single FTF.
The casings look pretty rough coming out of the rifle. I’m sticking to steel case for this rifle.

The head spacing was reduced to about .17.

Now that I know the rifle fire constantly, I’m going to look for up grades.

Thinking a retractable or folding stock
Bayonet adaptor or dust cover.
Let the parts hunt began.


Last edited by Rick Shaw on Sun Mar 13, 2011 9:03 am, edited 1 time in total.

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PostPosted: Sun Mar 13, 2011 1:23 am 
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For anybody interested.

For relible cycling of the C93, the Bolt gap (Space between the bolt head and carrier) Should be between .1 and .2. (If I'm wrong on the tolerence please correct me)
If Bolt gap is under .1, replace with over sized rollers. If over .2, replace with undersized rollers.

Rollers can be found at these two sources:
http://www.robertrtg.com/hk93roller.html
http://www.hkparts.net/shop/pc/HK-93-HK ... p-c171.htm

Here is a link to videos explaining how to measure bolt gap and how to replace the rollers.
http://www.militaryfirearm.com/Forum/sh ... .php?t=638

For about 15 bucks and 15 mins of installation, replacing the rollers is a great way to ensure your C93 isn't a jam o matic.

Here is a link to an in dept review of both ammo choice and the role of bolt gap in cycling;
http://hkpro.com/forum/showthread.php?1 ... ars.-Oh-My!

Hope this helps.


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PostPosted: Sun Mar 13, 2011 2:58 am 
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Rick Shaw wrote:
For anybody interested.

For relible cycling of the C93, the Bolt gap (Space between the bolt head and carrier) Should be between .1 and .2. (If I'm wrong on the tolerence please correct me)
If Bolt gap is under .1, replace with over sized rollers. If over .2, replace with undersized rollers.

Rollers can be found at these two sources:
http://www.robertrtg.com/hk93roller.html
http://www.hkparts.net/shop/pc/HK-93-HK ... p-c171.htm

Here is a link to videos explaining how to measure bolt gap and how to replace the rollers.
http://www.militaryfirearm.com/Forum/sh ... .php?t=638

For about 15 bucks and 15 mins of installation, replacing the rollers is a great way to ensure your C93 isn't a jam o matic.

Here is a link to an in dept review of both ammo choice and the role of bolt gap in cycling;
http://hkpro.com/forum/showthread.php?1 ... ars.-Oh-My!

Hope this helps.


On the 91/G3 and 93/33 bolt gap should be between min .1mm and a max of .5mm, with .45mm is supposedly considered "ideal" - although the 3 and 33 Amrorers manuals do not specify an ideal gap but calls for .004"-.020". A few other things to check for are ground bolt faces (look for a slight bevel on the bolt face edges), and cocking tube gap (the bolt carrier should not rest completely on the cocking shuttle). General rule of thumb is bolt gap + .015". Improper cocking tube gap can affect bolt gap as it may prevent the bolt from completely locking in the trunnion.

I'd avoid the HK retractable stock. Looks cool but really doesn't do a whole lot for cheek weld or your shoulder (that's why they call them meat grinders). And yup, these rifles mangle brass. A good addition is a port buffer (something I still need to add to mine).


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PostPosted: Sun Mar 13, 2011 7:55 am 
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Thank you Arkane for reminding me.

This rifle sticks to true HK rifle fashion and flings brass a good 20 feet to the right.
So unless you want to piss off the guy to the right of you at the range, look into a port buffer (Brass deflector).

Parts-
I found a choate folding stock for 90 buck plus shipping on gunbroker
I also got my hands on a bayonet adaptor for 16 bucks plus shipping.

That and extra 120 bucks or so added to the project.


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PostPosted: Mon Mar 14, 2011 2:39 pm 
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Found a port buffer.
http://www.hkportbuffer.com/product/mfimod_223.html

High impact plastic. 30 bucks.
This will be the last bit of money spent on this thing. Getting upgrade crazy.


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PostPosted: Mon Mar 14, 2011 2:51 pm 
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I use this port buffer from Robert TRG on my PTR-91. It snaps on rock solid and appearance is pretty good. Every rifle should have these. I still dent the hell out of brass though I can only reload about 70% of recovered brass.

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PostPosted: Tue Mar 15, 2011 3:34 pm 
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J.C. wrote:
I use this port buffer from Robert TRG on my PTR-91. It snaps on rock solid and appearance is pretty good. Every rifle should have these. I still dent the hell out of brass though I can only reload about 70% of recovered brass.


I looked at these and it says it has to be cut to fit the C93.


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PostPosted: Wed Mar 16, 2011 3:07 pm 
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Well added a choate folding stock to the C93.
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Image

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For 90 bucks I’m not unhappy with the upgrade.
It shortened the Length of pull, looks cool, and adds to the ability to transport it.
Other than that, it’s not much of an improvement over the factory stock.

The rifle is too heavy and cumbersome to shot with the stock folded.
This stock would be kick ass on a SBR HK 53, but on a C93 it’s just so so.

For me it’s not worth the upgrade for the retail price of 135 bucks. At 90, its just right.

Still waiting on my bayonet adaptor and port buffer.


Last edited by Rick Shaw on Wed Mar 16, 2011 3:28 pm, edited 1 time in total.

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PostPosted: Wed Mar 16, 2011 3:15 pm 
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Why didn't you go with the collapsible stock over the folding stock?

Oh. Nevermind. :shock:
Price: $412.95
:shock: :shock: :shock:

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PostPosted: Wed Mar 16, 2011 3:25 pm 
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Mr. E. Monkey wrote:
Why didn't you go with the collapsible stock over the folding stock?

Oh. Nevermind. :shock:
Price: $412.95
:shock: :shock: :shock:


Price and function.
I've heard more than one person call the HK Retractable stock a "Meat Grinder" with poor cheek rest

I did look at Ace stock.
http://riflestocks.com/store/page7.html
They have a reciever block for 45 bucks and an AR collapsible stock adaptor for 20. I have a spare ar stock tube in my hobby room.
It would only be 65 for an Ar stock on this baby.

20/20 hind sight it may have been a better way to go.


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