SR15 running suppressed questions

[MegademiC]

My 20 round Pmags often don't lock back when manually operating the action.

What gen? My gen3 spring is firm and always locks back. Wondering if the follower/spring tension is different between gens?

[Pappabear]

Good feedback guys, Ill run the curved Pmags Sunday and check it out. I bet the Car buffer is fine un-suppressed, throw in that variable and bolt speed goes mach 5

Even if it solves the issue, I may have to put in the A5, its been one consistency that has made my guns run 100% of the time.

PB

[Pappabear]

I notice a vast difference in the spring tension with the newer curved Pmag/20's be far superior. Could be the bolt is running faster than the follower is rising?

Ran to the range for a quick test. Gen3 20 round mag locked back every time. I dropped in a H Buffer and the original Colt mag, it locked back on our slightly milder reloads, but the BH Mk262 ammo was too much juice and it didn't lock back. Very happy I figured this out, many thanks to al that helped.

I am going to do what I always do, drop in the ubiquitus A5 system and life will be in equilibrium.

PB

[Jwknutson17]

If it's a 16 it would be the Car buffer. Also comes in the complete lowers. 14.5 and 11.5s come with the HH ( H2 ) buffer. If running suppressed I usually lean towards the A5H2 and green spring at least. If in a Car RE system a H2 and Blue spring is a good place to start suppressed on the 16 inch guns, H3 and blue run fine suppressed in all my SR15 guns too. I also run the A5H3 and green in all some of my suppressed 11.5 SR-15 guns. All seem to run well.

[Pappabear]

Jake, thanks for feedback. I’m going with A5 and make life easy. Good to hear other SR15 folks run the A5.

PB

[alx01]

Jake, thanks for feedback. I’m going with A5 and make life easy. Good to hear other SR15 folks run the A5.

PB

Let us know how Vltor A5 works out for you in SR15. I would appreciated the details such as buffer weight, spring used (USGI/Sprinco), ammo, weather conditions, and a general feel of A5 in this configuration.

[Wake27]

There’s been at least one fairly long thread about the A5 and KAC on here, Jack actually responded to it. Not sure how much of it discusses suppressed though. One nice thing to the A5 would be that it’s one less propriety part, if you use it on every AR. So you could theoretically switch between KAC and BCM uppers on the same A5 lower without having to change anything. My Noveske and BCM both have green springs and can cycle on either the -2 or -3, seems like 16” KACs will as well.


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[MistWolf]

What gen? My gen3 spring is firm and always locks back. Wondering if the follower/spring tension is different between gens?

Mine are 1st Gen.

[Pappabear]

There is little doubt in my mind I was the problem. The minute you toss on a can, you have modified the gun. I should have known at a min an H buffer and will definitely benefit from A5. Mega yes the bolt was out running the weak spring 20 round Colt mags.

The Gun cycled softer even with a an H buffer, it was noticible. Like I said I ordered the A5, I just need to waste a little more money on a KAC can to round out the equation.

[markm]

We haven't had to correct buffers in so long, it didn't cross our minds that this was the issue.