Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login
Site Notices
1/25/2018 7:38:29 AM
Posted: 7/5/2002 5:47:42 AM EST
I'm building a 7.62 AR first instead of the 9mm conversion.

Besides the mag issues, is there anything I need to be aware of.
I'm concerned about checking the head space and
any bolt carrier problems.
Need you advice and comments.
Thanks
Link Posted: 7/5/2002 5:54:57 AM EST
7.62x51 or x39?
Link Posted: 7/5/2002 6:03:09 AM EST

Originally Posted By ilikelegs:

I'm concerned about checking the head space and
any bolt carrier problems.
Need you advice and comments.
Thanks



After you answer Stormbringer's question, I would head down to Dave_G's "Maintenance & Cleaning Forum" with the same post - those guys that hang out there are GOOD !
Link Posted: 7/5/2002 6:20:22 AM EST

Originally Posted By Stormbringer:
7.62x51 or x39?



7.62 x 39

I'm keeping within my philosophy of just a few calibers on hand, .223 for the AR's, 7.62 x 39 for the AK's, and 9mm for my Pistols and soon the 9mm conversion for the AR.
Thanks
Link Posted: 7/5/2002 6:31:18 AM EST
There are no problems that I can think of I have a DPMS 7.62x39 AR and it shoots great.
I would suggest buying a complete upper from them and using your existing lower.
The mag issue is really not a problem I have had good luck using the USA 7.62x39 mags with no jams whatsoever in both the 30 and 10 round capacities.
Link Posted: 7/5/2002 7:00:42 AM EST

The only issue I've encountered is bolt lugs breaking. I've run about 4K through my upper and broken two bolts.
I'm going to try and find a true Colt bolt, but they are scarce, out of stock (last time I looked)and expensive @$175 for just the bolt.
Stripped DPMS bolts run under $50 IIRC.

It's still my favorite setup for steel.

Link Posted: 7/5/2002 7:30:53 AM EST

Originally Posted By Waldo:

The only issue I've encountered is bolt lugs breaking. I've run about 4K through my upper and broken two bolts.
I'm going to try and find a true Colt bolt, but they are scarce, out of stock (last time I looked)and expensive @$175 for just the bolt.
Stripped DPMS bolts run under $50 IIRC.




Bolt breaking ?
That's discouraging.
Is this a problem with the 7.62 AR's ?
How common is this ?
Link Posted: 7/5/2002 7:44:44 AM EST
I have two pre-ban Colt Sporter lightweight 7.62x39 AR15s and they both run like champs.

No broken bolts on mine. That could possibly be a problem with some DPMS or Olympic Arms parts, but Colt magnetic particle tests their bolts and bolt carriers to ensure that they are free from internal defects.

Others who run the DPMS 7.62x39 upper receiver assemblies on top of full auto M16 lowers haven't reported problems with broken bolt lugs, so maybe it's just an isolated incident.

As for the magazine issues, here is the most recent thread addressing them: Tell me about 7.62x39 mags for AR's please
Link Posted: 7/5/2002 7:51:33 AM EST

Originally Posted By DOCPIG:

The mag issue is really not a problem I have had good luck using the USA 7.62x39 mags with no jams whatsoever in both the 30 and 10 round capacities.



D. PIG,
I'm powerful reluctant to say anything good about USA mags but in this case you're right !!

I had a Colts' in 7.62X39 for a short while and the USA 30's fed better than the two Colts' 20-round factory mags.
Link Posted: 7/5/2002 10:36:21 AM EST
Thanks for the comments guys, I'll keep you posted on the
progrees and post some pic's when its finished.
We have a big gun show next weekend in Dallas
so I will hopefully find the upper there.
Looking for it to be a Colt flat top upper.

Keep posting here if you think of anything else.
Link Posted: 7/5/2002 11:28:54 AM EST
Link Posted: 7/5/2002 2:48:13 PM EST

Originally Posted By Troy:
Due to the large case head on the 7.62x39 round, the bolt face has to be machined out much more, leaving much less material connecting the bolt lugs to the bolt. It isn't unusual for them to break, unfortunately. The AR10 bolt is quite a bit larger for this reason.

-Troy



Thanks Troy
Top Top