Learn me up...... 7.62x39 ar

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hfx123

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Taking a stab at this. Want to use calibre for next build. What do I need?
Regular bcg with a different bolt?
Different firing pin?
Buffer?
Will I need a bigger gas port?
Obviously a barrel and mags but what else would I need to get this rolling?
 
To get you going:

Yes a regular bolt carrier with a 7.62x39 Bolt. LMT's enhanced bolt is by far the best one. An extended firing pin and sometimes an extra-power hammer spring for reliability are a must. A standard carbine buffer is fine and can experiment with different weights if need be. Most barrels specific to that caliber will usually have the appropriate sized gas port already drilled out so hopefully it won't require further modification on your part. Hope that helps!
 
i built my custom with nea barrel/bolt/extended firing pin (gen2) and its awesome, put an acc 51t brake on it and a wolffe extra power hammer spring in my geisselle s3g trigger.

with the advent of plug and play "competion" trigger remember that only the traditional type trigger can be upgraded easily, through my contact with geissele i found out they use a standard weight hammer spring, and swapping in an extra power hammer spring was both OK as well it would not increase the trigger pull weight

timmney makes an ar10 trigger, elftman has a 308 hammer you can retrofit and triggertech does not offer a 30cal specific trigger but they said the ar15 trigger will work as is... (from 3 different sources i have heard that triggertech gets light primer strikes with surplus)

so to me the biggest hurdle is the trigger and making sure you get something that will ignite chinese/czeck and russian surplus.... if your only going to be shooting federal or remington commercial ammo you might be able to use a 223 competition trigger, but in my mind even if it works it is still a liability (yes i am paranoid)

another thing is buy yourself a magpul grip with bolt/firing pin insert and keep a spare bolt/firing pin in it.... the nea is very stout but again, me being paranoid i do worry about bolt breakage., spare complete bolt and firing pin are around $70

my buddy has thousands and thousands of round thru his factory nea with zero issues
 
note, nea bolt is specific to their barrel extension which is why the bolt face has thicker walls then say an lmt or rra bolt..... nea is a good solution to an age old problem.
 
TinkerBell said:
note, nea bolt is specific to their barrel extension which is why the bolt face has thicker walls then say an lmt or rra bolt..... nea is a good solution to an age old problem.
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That's for their enhanced 7.62x39 bolt? I tried for ages to find the bolt face picture for NEA bolt compared to "standard" thin walled one. It does make sense though.

But nowhere I could see they say it is a proprietary bolt. That's limiting already limited market.
 
If you don't want NEA products, than get your barrel and bolt from Brownnells, everything else is just standard Mil Spec AR parts.
 
hbean said:
If you don't want NEA products, than get your barrel and bolt from Brownnells, everything else is just standard Mil Spec AR parts.
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Yep it's just barrel and bolt I guess. I can get xcr pistol mags etc here. Probably barrel and bolt as well maybe.

What's process? Never used brownells. Barrels are no problem to order? Export fee?
 
hfx123 said:
I don't really want anything to do with an nea barrel tho. Does this combo railroad me into an nea barrel?
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i am far far far away from being an nea fanboy, but in my personal opinion for this instance of bare barrel/bolt/extended firing pin they make a premium product.... frankly all the horror stories on ar15.com suggest it is not if, but only when an x39 starts shearing lugs, in that regard being a canadian company is a positive thing (and we all know nea has a great warrenty rep.)

i built mine from a dd upper, dd stripped bolt carrier with cmmg rebuild kit and a bcm kmr 13" free float rail, bcm 750 low pro gas block (screw type), everything installed easily and i have had only one ftl due to magazine issue out of 200 rnds (yes not much... but i only just built it)
 
TinkerBell said:
i am far far far away from being an nea fanboy, but in my personal opinion for this instance of bare barrel/bolt/extended firing pin they make a premium product.... frankly all the horror stories on ar15.com suggest it is not if, but only when an x39 starts shearing lugs, in that regard being a canadian company is a positive thing (and we all know nea has a great warrenty rep.)

i built mine from a dd upper, dd stripped bolt carrier with cmmg rebuild kit and a bcm kmr 13" free float rail, bcm 750 low pro gas block (screw type), everything installed easily and i have had only one ftl due to magazine issue out of 200 rnds (yes not much... but i only just built it)
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Yeah I hear what you are saying it's not the components really it's more so the barrel. I have read some pretty terrible reviews on their barrels


Any sponsors have the bolt/extended pin etc?
 
canada ammo or sfrc are the main dealers, i think sfrc has a closer arrangment with nea so he may be best bet, but your in calgary so canada ammo has free shipping and usually same msrp on nea stuff.

i bought my spare bolt/pin from canada ammo and had great service.
 
hfx123 said:
What's process? Never used brownells. Barrels are no problem to order? Export fee?
Click to expand...

Create an account just like any other online website, certain items are not exportable, but when they process the order they will let you know. anything under $100 there are no extra hoops you have jump through. over $100 and below $500 they will ask you to fill in a End User Certificate, it takes about 5 minutes, they don't send that in to the States Department, they just need to have a copy of it on file. Than anything over $500, that is when you will need to do more paperwork and apply for an export permits and pay the fee.
 
I would have to dig into a search to quote specifics. I don't have the time at the moment but can pull it back up tonight. Review stated lots of fliers, inconsistent finish, poor accuracy, get what you pay for etc. I'll try to find them again

Here are a couple and are almost a year old. Also disclosure there were others that were good reviews. That said some manufacturers have zero bad reviews so it's maybe a personal thing

1.I rarely post, but I am going to share my experience about NEA.
I was building an AR15, and figured at 10.5", the NEA barrel would suffice. Also, I liked the look of the handguard (except for the weird color black they use, but I'm going to cerakote it anyway), and a low profile gas block is good as any other right?
The barrel was a disaster. Their own low profile gas block had about 0.008" of play over the barrel. It was so loose. Worse yet, the index pin was 0.135", when spec is 0.125". It would not fit in the receiver I had.
Their customer service was great however, and they were quick to respond to emails. I was a bit surprised that they suggested that I initially just grind the pin down (didn't I buy a mil-spec product?) , but they did replace it after I shipped it to them (on my dime).
The barrel I got back had a tighter fit to the low profile gas block I had, and it did fit into the upper receiver I had. However, the feed ramps didn't line up well with the M4 ramps on my upper receiver. I put it together anyway, and I don't yet know if it will cause feed issues. It does irritate me though.
Now, the hand guard: When I initially torqued the barrel nut onto the upper receiver to the min 30 ft.lbs, about a quarter of the teeth snapped off. Seasoning the threads resulted in additional teeth breaking off; only about half were left when the hand guard actually slipped on. Also, the indexing protrusion does not leave the rail perfectly flush with the rail on the upper receiver. It is very very close, and a little grind of the protrusion will fix it, but still....annoying.
Anyway, NEA: great customer service for not-so-great products. Will not buy again.

2.guy at my range had his barrel extension out of spec and it exploded. Lucky he was wearing eye protection.
 
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Just a heads up, Canada Ammo is having 25% off NEA sale this weekend, the complete kit (barrel/bolt/firing pin) is only $299 - 25%
Plus free shipping, 16.1/14.5/7.5 inch barrel in stock
 
I completely trust the barrels, installation of everything wa tight and in spec.... I used the bcm low pro gas block,dimpled the barrel for install and had to use moderate pressure from 8oz safety hammer to get it seated. Same deal with barrel, fit the reciever fine and I used a bcm barrel nut
 
In my opinion, if you want a 7.62x39 AR this is the only rifle worth looking at.

https://shopquestar.com/shopping65/shopexd.asp?id=2615&bc=no

It was actually designed for x39 and the bolt is not a machined 223 bolt that is so thin you'll end up shearing off lugs. It uses magazines designed for x39 so no binding of a tapered case in a straight magazine.
Converting a standard AR to x39 is a retrofit and you'll be pissing around trying to balance out gas system and recoil system, some magazines feed, some don't. Save yourself the hassle and just start with a rifle made for the cartridge.
Unfortunately even though it shares very few parts with an AR the powers that be deemed it an AR variant. If it could be converted to non resteicted with an 18.6 barrel I would be all over this one.
 
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