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Posted: 1/25/2015 7:23:03 PM EDT
[#1]
Is the recoil bottoming out against the stock? The x39 round is naturally more potent so if it's just at the muzzle then not an issue.
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Posted: 1/26/2015 3:38:07 PM EDT
[#2]
You need to watch your hammer and trigger pins like a hawk, and I would suggest you use stronger-than-milspec hammer and trigger springs as well. Play close attention to your ROF, too, and to the top of your disconnector.
The potential danger is that x39 will cycle more violently and the steel hammer will beat the crap out of your steel disconnector, transmitting the force through the steel pins, with the alloy walls of your receiver ending up taking the beating. In other words, enlarging the hammer- and trigger-pin holes. I don't run my Colt M16A1 in any caliber other than 5.56, and done so haven't for the last few years. I've just seen too many enlarged pin holes to be comfortable doing so. YMMV. 
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Posted: 1/27/2015 7:58:02 AM EDT
[#3]
Since the velocity of the bolt/carrier is a function of the gas pressure in the bore, not the size/weight/velocity of the bullet, I have no problem using my lower with other calibers up to and including .458 SOCOM. As long as the upper is gassed properly, the action will operate just like a .223- the gas in the bolt carrier making thing go doesn't care what caliber generated it.
The extra recoil you feel at the shoulder is generated before the bolt even unlocks, so it has nothing to do with any possible extra wear on your hammer or trigger pins and if your upper fits the lower properly, the recoil energy is transmitted straight back into your shoulder. If it's not strong enough to injure your shoulder, it won't hurt your receiver. An upper that fits the lower poorly could put extra force on the takedown pins. Where you have to watch out is the 9mms. The action has now gone from gas operation to straight unlocked blowback and things can get violent in there. The AR-15 design was never intended for that and there's just not enough room in there for a suitably heavy bolt. Just my opinion, YMMV, etc. |
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Posted: 1/27/2015 11:52:32 AM EDT
[#4]
I've put over 8k round of 7.62x39 thru my favorite lower w/o problems. It was great when I could get it at $89/k but now 223 is the cheapest to shoot. You may want to look into a Smith brake as it seemed to tame the recoil better.
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Posted: 1/27/2015 11:22:41 PM EDT
[#5]
Quote HistoryQuoted:I don't run my Colt M16A1 in any caliber other than 5.56, and done so haven't for the last few years. I've just seen too many enlarged pin holes to be comfortable doing so.
YMMV. What about with a Group Ind M16A1? Steel receiver = 7.62x39 GTG? |
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Posted: 1/28/2015 9:45:32 AM EDT
[#6]
Just buy a ak47! You would have to use a extra power spring on the hammer.just my 2 cents.
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Posted: 1/28/2015 5:18:18 PM EDT
[#7]
Quote HistoryQuoted:
What about with a Group Ind M16A1? Steel receiver = 7.62x39 GTG? Quote HistoryQuoted:
Quoted:I don't run my Colt M16A1 in any caliber other than 5.56, and done so haven't for the last few years. I've just seen too many enlarged pin holes to be comfortable doing so.
YMMV. What about with a Group Ind M16A1? Steel receiver = 7.62x39 GTG? Shouldn't be any problem at all with a steel receiver. |
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Posted: 1/29/2015 11:58:52 PM EDT
[#8]
Quote HistoryQuoted:Shouldn't be any problem at all with a steel receiver. Ok cool. Gonna try a PWS MK107 7.75" 7.62x39 upper with it suppressed and unsuppressed. 10.5" 9mm upper too. Anyone know whether Geissele SSF pins are mild steel or something harder? |
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