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Posted: 4/11/2011 10:05:23 PM EDT
| Ok was thinking of going 7.62x39 for next build any info on parts do i need a dedicated lower and upper or will some of my old ar parts work on this build any pics of black rifle Aks you guys have built thanks |
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good luck getting quality mags http://www.photomosaic.com/gns/AR47/AR47-800.jpg |
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I have 2...
First get a stripped upper. I'd strongly recommend lapping the upper to ensure squareness for the bolt lugs. Anything to help longevity is a plus in this caliber. Use a quality upper such as LAR (Cerro forge/keyhole) or Cardinal Forge. Best barrel I've used that is *available* is from Model 1 Sales. Get a bolt or complete BCG from them and their enhanced 762x39 firing pin because of the design to allow about .05 additional protrusion. The FP is avail by phone only. A carbine gas system will run fine. ARP does sell x39 barrels and bolts and I'd recommend them but last I heard they were waiting on parts right now. You'll want a H or H2 buffer as the recoil is slightly more than 556 but its not at all unmanageable. I have a 10.5" SBR and it's similar to the 9mm recoil of my Beretta CX4. The mag problem will persist until CP gets manufacturing again so your best bet is to try to find 10rd 6.5 Grendel, 10rd 6.8, or obviously the 10rd x39 mags. Finding a reasonably priced 30rd mag will be a challenge right now. |
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I used parts from all over the net on my build. The only parts I feel are absolutely needed are the enhanced firing pin from Model 1 Sales and an upper with feedramp extensions. ASC magazines are the only option for 30 rounders right now. They are exact copies of C-Products. All mine had problems loading over 20 rounds but feed 20 just fine.
My build was centered around an Osprey Defense piston kit. Aside from the SI Defense bolt, Adams Arms bolt spring, POF cam pin and M1S firing pin, all of the other parts were standard AR15 carbine parts. The barrel was a Del-Ton with 5/8-24 threads. Posted Via AR15.Com Mobile |
| Upper with m4 feedramps is good, galati international also sells a x39 firing pin. Wolf xpower hammer spring is a neccesity. i used a 5.56 doublestar lower and a lmt upper, rifle performs flawlessly. the magazine issue is an issue, although a company called asc is apparently selling c-products mags (according to the chatter) though i have not found them myself. Mgi makes a lower that takes ak mags if you've got the dough. Good luck and happy shooting. |
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I'm running a standard FCG with standard springs and a M1S firing pin. Out of 250 rounds I only had 1 dud round that didn't fire on 2 tries. I have not had 1 light primer strike yet.
(ETA: I'm also running a standard carbine buffer and spring on a carbine length gas system. It cycles and loads Wolf just fine after cutting feedramp extensions and re-checking the FSB was on straight over the gas port. No need for special parts unless you are running hot ammo,) And ASC makes and sells thier own mags direct. They apparently bought the tooling and design from CP. The 30 round mags are exactly whar CP sold before the shutdown. They just have blank floor plates. Posted Via AR15.Com Mobile |
DPMS with Colt barrel, CProducts magazine BSA red dot. My basic semi-auto 30-30.
Trimmed firing pin to take care of light primer strikes (Bedan pockets are deeper) Had trouble keeping gas block aligned over port, finally dimpled barrel under screws and Loc-Tited screws. Almost forgot! DPMS A2 .30cal flash hider after a big scorch mark on the new jacket I was using for a rest. 
Jack 
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My PWS Diablo 7.62x39 had a light primer strike, is this a firing pin or hammer spring issue?
I'm glad I saw this thread because my 30 round mags have issues if they are loaded full. The mags just don't feel solid, they use very thin sheet metal. It seems like someone could upgrade the design of these mags to allow a full 30 rounds and fix the tilt issues. |
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My PWS Diablo 7.62x39 had a light primer strike, is this a firing pin or hammer spring issue? I'm glad I saw this thread because my 30 round mags have issues if they are loaded full. The mags just don't feel solid, they use very thin sheet metal. It seems like someone could upgrade the design of these mags to allow a full 30 rounds and fix the tilt issues. Use (borrow if you have to) a dial caliper. The back side were the slide comes out can be used to measure firing pin protrusion. Obviously if you have a proper depth micrometer that will work a lot better, but if you take your time a regular set of calipers will work. If your FP protrusion is less than .035" think about extending it to there or possibly up to .040" A search will get you some instructions on extending the FP protrusion. If the protrusion is OK get a Wolff extra power spring. I did both. No more primer strike problems. |
| I'm working on a x39 build, I'm actually using an MGI lower receiver, I have both AR and AK style mag wells. I bought the upper receiver from a member here on EE, I'm looking forward to completing this thing so I can check on any feeding issues that may come up, if my C-Products mags don't feed even after "hammer" treating them, I'll switch to the AKs permanently. |
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I wish someone makes a lower that takes the AK mags (besides the expensive MGI). Special Weapons no longer makes them but I doubt I'd want to support those guys even if they did. I don't even know if they are still in business. I wonder how well they would sell if someone made one for around $250-$300.
Here's my 7.62x39 build. It works great with C-Products 10 rounders but the 30 rounders have never worked well - which are the latest version with new springs and followers. 
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http://i114.photobucket.com/albums/n279/bajame/ARP762x39mm006-1.jpg My 30 rd c mags are working 99.99% or better. http://www.ammosc.com/ This Company is starting to make mags simsilar to the cmags and they are supposed to be shipping in 2-3 weeks they say. They also said they are not c products but use the same parts vendors to build the mags... ok... I really enjoy shooting my x39 and the bananna mag look is pretty interesting on a ar15 I think. Seems like some folks are a little critical of the x39 but personally I like a challenge =) If you have problems with m fires then possibly look to extending the fp protrusion as stated. cheers all ILB |
ArmaLite barrel, Model 1 Firing pin and bolt:
AR Performance barrel and bolt, std. firing pin: 
Bushmaster barrel, LMT bolt and Model 1 firing pin: 
Model 1 barrel, LMT bolt and Model 1 firing pin: 
Model 1 7.62x39 firing pin (top): 
LMT 7.62x39 lobster tail bolt: 
The MGI bolt was a disappointment as when it broke MGI would not sell me replacement parts. |
| I took my newly completed 7.62x39 out yesterday, I had a few misfeeds with both AK and AR style mags, although it seemed to iron itself out with a few more rounds. Overall I was pleased, I think it may need a little polishing to get it 100% reliable, but I must admit, it was a lot of fun to shoot, I shot several weapons yesterday, but the x39 is a thumper!!!! I'm looking forward to getting it all dialed in with all my accessories and optic for another range test! |
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I just did some polishing on my 10.5" x39 SBR and I used those 3M 1/3 size sheets from an auto parts store ranging from 320 - 480 - 600 - 800 - 1000 - 1500 - 2000 and the feedramps are almost mirror-like. I imagine feed issues will likely be a thing of the past
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I recently did some range testing Sunday. A *little* windy––20mph or so.
Equipment: 10.5" barrel, YHM Phantom QD 762 Mount Aimpoint 2000 4moa in Vortex Optics 30mm mount CProducts 10rd magazines YHM Specter LW FF forearm LMT SOPMOD lower 10 shot groups at 25yds (zero), 50yds, and 100yds. The 50yd 10 shot group was basically a smiley face. Out to 100yds not so much. 25yd zero gave about 2" high at 50 and 3" high at 100. Will post pics when I get home. |
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I recently did some range testing Sunday. A *little* windy––20mph or so. Equipment: 10.5" barrel, YHM Phantom QD 762 Mount Aimpoint 2000 4moa in Vortex Optics 30mm mount CProducts 10rd magazines YHM Specter LW FF forearm LMT SOPMOD lower 10 shot groups at 25yds (zero), 50yds, and 100yds. The 50yd 10 shot group was basically a smiley face. Out to 100yds not so much. 25yd zero gave about 2" high at 50 and 3" high at 100. Will post pics when I get home. I am "earlier adopter" of the x39. I was kind of a pioneer in making mine reliable. Not many people had answer for me, but when I finally figured it out, it was and still is a shooter. I could shoot Wolf FMJ at 215yds 8" steel plate (or so) with semi rapid speed and hit the plate 8 or 9 out of ten times. This was with a cheap BSA scope. I let someone at the range shoot it while I shot his Marlin, and he said "this thing will hit anything." I am very happy with mine. Would be more happy with 100% mags. |
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I just did some polishing on my 10.5" x39 SBR and I used those 3M 1/3 size sheets from an auto parts store ranging from 320 - 480 - 600 - 800 - 1000 - 1500 - 2000 and the feedramps are almost mirror-like. I imagine feed issues will likely be a thing of the past Please school me on the feed ramp polishing procedure you used on your weapon, my rounds are getting hung up BAD using AK mags, the AR mags are okay, but not as smooth as I'd like... |
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I must refer to the use of a dremel with an orange or green grinding cone to match them to the upper receiver. Extending them by about 1/8" and it will take some anodizing off the upper receiver's feedramps but you want them lined up for smooth feeding.
Once that's done rip off a strip about 1" wide and roll it up into a "tube" about 1/8" diameter. Pretty small, and reciprocate up and down the feedramps about 50x on each grit and on each ramp. It will take the roughness off and go up to the next grit once you think you've smoothed out the ramp enough with each grit. Keep going until you get to 2000 grit and it will be slippery at that point. The ramps look really nice on this upper and i'm sure they'll stay that way for a long time. If I have to redo it i'm not removing any more metal just cleaning it up. |
| As I posted in past years, Mine is still going a 100% and I use the Wolf Military Classic with the large Hollow Point for hog hunting. I searched and bought a few Franken Mags. Dremmel the Feed ramps a bunch, the cartridge seems to tip nose down because the bolt only catches on the top of the case head. I honed the tail of the bolt down till a regular firing pin will work, the bolt is already dedicated to calibur. Standard hammer springs will work, just bend them forward for more power. My model 1, E R Shaw barrel shoots the wolf very very accurate. The 1x10 twist stabalizes 220gr RN and 200gr SP, sub-sonic and suppressed. I do not shoot subs in it any move because I built a 10 1/2" 300 Whisper for sub use. |
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Dremmel the Feed ramps a bunch, the cartridge seems to tip nose down because the bolt only catches on the top of the case head. This is happening to me when using AK style magazines, I have an MGI lower so I swap out magwells at will, my C-Mags do have some hiccups, but not many, my feed ramps need help and my bolt is only catching the top of the case head as you stated. In your opinion, will a good feed ramp job fix this? |
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I do not know anything about the C-Procucts Mags, I have only used the Franken Mags, a couple of 20s and 30s and some still new in the wrapper. and 20rd .556 mags with up to 10. I only shoot Hollow Points which should be more problems, but I do not have any. You can file the inside front of the mags for a forword chamfer. Dremmel the feed ramps down even or below the top of the mag that you are using and use a cone shape rock and not a bur bit to keep it smooth and can use some emory cloth like previous thread mention. I used a 1/4 stick of craytex in my bur grinder to polish ramps. I did not think there would be a feed issue with a MGI and AK mags.
Hey corn, wish I could have came over to meet you whin you hunted with thedehoganator. |
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When I make it home today I will post pics of the feedramps in my 10.5" upper for reference. You'll see how shiny they are This would be great!!!! I really appreciate you taking your time to do this. As for the MGI lower and AK mags, they don't feed almost at all, I would say, maybe 1% of the time they feed, the rest of the time, I'm there messing with them! |
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As for the MGI lower and AK mags, they don't feed almost at all, I would say, maybe 1% of the time they feed, the rest of the time, I'm there messing with them! Doesn't the bolt carrier have to be modified for use with the AK mags. I know MGI sells a modified bolt carrier. If this has already been done just disregard this. Also, i've had great luck with the bushmaster "wide mouth" feed ramp and the latest C products 30rd mags. Haven't had a feed issue yet just crappy golden tiger rounds that don't want to go bang. 
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Quoted:LMT 7.62x39 lobster tail bolt:
http://i150.photobucket.com/albums/s95/MMcfpd/LMT_762x39_bolt_a.jpg The MGI bolt was a disappointment as when it broke MGI would not sell me replacement parts. Where can you get the LMT lobster tail bolt? I didn't see it on LMT's website. |
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Quoted:LMT 7.62x39 lobster tail bolt:
http://i150.photobucket.com/albums/s95/MMcfpd/LMT_762x39_bolt_a.jpg The MGI bolt was a disappointment as when it broke MGI would not sell me replacement parts. Where can you get the LMT lobster tail bolt? I didn't see it on LMT's website. Quoted:
Call them. As the man said. |
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Thanks MM
Remove the baseplate, keeping the spring captive with your hand. Put the new ranger plate into the bottom and push it in until the Magpul plate can attach to the mag body. Makes it a little nicer when inserting but might get in the way depending if you use a full size VFG. The Larue FUG on mine is set in a distance of a Magpul XTM I just happened to put rail ladders on recently. You'd be GTG for a AFG or shorty grip but something like a KAC VFG might need to be pushed out further. |
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PD...,
Only for the MGI AR47 lower to work not non AK mag regular lowers, the bolt carrier and upper require a modification. I didn't catch if you were running a MGI complete upper as well. If so then it's just a glitch they need to smooth out. If its a regular upper with a non MGI bolt carrier they or somebody have to do some milling or dremeling to remove material from the the bolt carrier and the upper to accommodate the AK mags. I found this out from a guy here named " lumber jack "who had a non MGI upper & carrier on a MGI AR47 lower. Maybe you can IM him for more exact info? Here is his modified upper that works on a MGI AR47 lower. http://www.ar15.com/forums/topic.html?b=7&f=119&t=863188 Hopefully this answers a lot of questions for you. |
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