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Posted: 10/28/2010 5:29:08 PM EDT
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Hey guys-
I really want to finish an AR build I "started." I got caught up in a flurry of debit card madness and wound up with a completed 5.56 lower from DSArms. After a recent conversation with a co-worker, I'm shopping around for uppers.. I want a 7.62 AR, as I'm an AK guy and see no need to go 5.56 for one weapon.. I enjoy building things, so I'm thinking about building up, instead of dropping $650 on an upper, and I love to tinker anyway, so I'm thinking about slowly building one.. Am I better off just saving and buying a complete rig or could I save some $$ and piece it together? I am thinking about the following setup: Barrel & Bolt- ar15performance Flat top upper receiver- DSArms (since it will match my lower) Carrier and parts- Bravo Company Machine Gas block- Yankee hill machine flip front site gas block Comments? Jeff |
What you describe is almost exactly what I have here:
IIRC my upper came from Bravo Co. The upper pictured is my current favorite 7.62x39, although I will note that it doesn't light off Wolf 100% of the time (it does fire most of the time). I do have couple of others that use LMT bolts with Model 1 firing pins that have been 100% with the steel case (Wolf, Monarch, etc.); it's not a big deal for me because I shoot mostly Prvi and Fiocchi brass ammo. ETA - Now that I think about it, the two guns that fire the Wolf every time have Geissele triggers while the one pictured has a Wilson TTU. Considering that one of the fixes for the failure to fire steel case that people have mentioned in the past is to use a stiffer hammer spring, perhaps I'll try the AR Performance upper on one of the Geissele triggered lowers and see if that makes the difference. |
| I enjoy my 7.62x39 AR very much, and shoot it more than any of my other AR's. It's nicely accurate and hits steel plates hard. I wish C-products would make 20 round mags and/or work all the kinks out of the 30rd mags. I only load 15-18 rounds in my mags to ensure total reliability or I use my 10 round mags. It's at least as accurate as my .223 AR's and that even shooting cheap russian 7.62 ammo. My rifle has M-4 feed ramps which I feel helps with reliability somewhat. I'm an AK guy and really like the 7.62x39 round. It would be nice if the original frankenmags were still available. |
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You won't be sorry going with the ARP barrel and bolt with midlength gas. I also used them along with a BCM carrier, YHM lo-pro gas block, and with current production CP mags the rifle has run 100% and has been much more accurate than I ever would have dreamed with Wolf black box ammo. The thing is a dream to shoot and while I have not actually shot any groups for record other than sighting in, ringing the 18 inch 200 yard gong with YHM QDS BUIS sights is downright boring. You'll love it.
By the way, the way the ARP Super Bolt is cut, you will not have any trouble firing any ammo you run through it. They cut the bolt so you get the .038 firing pin protrusion so running a standard hammer spring still lights them off with perfect reliability. I am running a RR NM 2 stage tuned by WOA and set at 3.5 pounds with standard RR springs and it has never gone "click." |
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By the way, the way the ARP Super Bolt is cut, you will not have any trouble firing any ammo you run through it. It hasn't been 100% with Wolf for me, but it has been close. As noted above, I'm going to try the ARP setup with a Geissele FCG. Just wondering what issues you are having with Wolf? Not firing or case getting stuck in chamber? |
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... Am I better off just saving and buying a complete rig or could I save some $$ and piece it together? ... Flat top upper receiver- DSArms (since it will match my lower) ... Jeff You won't save money building up just one upper (cost of punches, upper block, barrel wrench, snap ring pliers, grease) BUT you will have built exactly what you wanted with no leftover / throw-away parts. AND you'll have the tools for another upper build - then you'll start saving money (making uppers for friends, family, self, etc). I'd get the tools. You can always barter a 12-pack or a box of ammo in helping others assemble an upper. Get a flat top upper with integral M4 feed ramps. |
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FWIW - because it's seen very limited usage so far - but I have, on the recommendation of another member here - used a C Products 25 round 6.5 Grendel mag loaded to 20 rounds with three different 7.62x39 AR-15s with nary a hiccup. You are lucky, I just bought 5 CProduct 25 round 6.5 mags and I am having all sorts of problem running x39 thru them. I think I may send them back and just stick with my 10 and 30 rounders. |
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I thought a C Prod 25-round 6.8 mag loaded to 20 rounds might work, so I bought one at the local gun shop for about $17. After loading/unloading the mag several times to see how the column of rounds sat in the mag, I decided to cut off some of the length of the follower legs to allow the follower to tilt a bit more to conform to the angle of the first round in the mag no matter the capacity. Though it worked, it didn't work reliably. I posted my results here a month or so ago, and Chad from C Prod kindly replied to my message stating some of the difficulties they had when trying to perfect the 30-round 7.62x39 mag, and that explained why my $17 experiment flopped.
One of the things I've noticed between the C Prod 30-round 7.62x39 mag and the 25-round 6.8 mag (don't know if this applies to the 6.5 mags cause I don't have any) is that the front-most indented "rib" on each side of the mag sits further back on the mag. I believe this is done so the rib guides the neck of the case instead of riding against the bullet or the case body. Not sure why this is important, but it was apparently important enough that C Prod employs different ribs for the two mags. If you compare the two different mags side-by-side you can see what I mean. Interestingly, the C Prod 10-round 7.62x39 mag that came with my factory Armalite looks like it's based on the 6.8 design, not the 7.62x39 design, and it does not work reliably, unlike my 30-round 7.62x39 mags that run flawlessly. |
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Sorry to hear that. this is the first time I have heard anyone has had a problem with their 10 rounder.
Today I took the hammer to the 6.5G 25 rounder and did the U tube mode to it, hoping that it would fix the problem, but it made it worst. The problem is two fold; 1. ammo gets hung up in the magazine, 2. Round will hit just below the feed ramp so it won't feed. BTW, I only load 20 rounds in the mags. This weekend I will work on the feeding ramp a bit, hopefully it will fix the second problem. |
| hobbyist, going against the information that Chad from C Prod provided, I cut down a 30-round 7.62x39 mag to reduce the capacity to about a dozen rounds. I simply couldn't resist the temptation to have a smooth-running mag for shooting from the bench. I still have some clean-up work to do on the edges of the mag before I bend the tabs to hold the floorplate, but if this modification works to my satisfaction, I'm going to try cutting down another 30-round mag to hold approximately 20 rounds. I'll report with the results. |
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I enjoy my 7.62x39 AR very much, and shoot it more than any of my other AR's. It's nicely accurate and hits steel plates hard. I wish C-products would make 20 round mags and/or work all the kinks out of the 30rd mags. I only load 15-18 rounds in my mags to ensure total reliability or I use my 10 round mags. It's at least as accurate as my .223 AR's and that even shooting cheap russian 7.62 ammo. My rifle has M-4 feed ramps which I feel helps with reliability somewhat. I'm an AK guy and really like the 7.62x39 round. It would be nice if the original frankenmags were still available. Send me an email and I can help. [email protected] Chad |
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FWIW - because it's seen very limited usage so far - but I have, on the recommendation of another member here - used a C Products 25 round 6.5 Grendel mag loaded to 20 rounds with three different 7.62x39 AR-15s with nary a hiccup. You are lucky, I just bought 5 CProduct 25 round 6.5 mags and I am having all sorts of problem running x39 thru them. I think I may send them back and just stick with my 10 and 30 rounders. The 25rd 6.5 Grendel magazines are not designed to run 7.62 X 39 ammo. Chad |
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