AR-15 Subsonic Feeding Problem

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promptcritical
New Member
Posts: 3
Joined: Sun Jan 23, 2022 3:58 am

AR-15 Subsonic Feeding Problem

Post by promptcritical »

I built up a 300 BLK using Wilson Combat parts (11.3” barrel & pistol gas. Unsuppressed-suppressors are not an option here).

It will feed supersonic rounds just fine and I’m using 300 BLK pmags (I’ve also tried 5.56 pmags with the same results).

When shooting subs it jams after 3-4 rounds (rounds don’t feed into the chamber and are stuck with the tip in the barrel extension and other end of the case resting on the next round in the magazine).

The ammo is Hornady Sub-x in 190 & 220 grain (only subs I can find locally).

I’ve tried all combinations of light and heavy buffers (from 2 to 4 oz) and strong and weak buffer springs (all of Sprinco’s different springs).

Anyone have a suggestion (Ammo or rifle)? (It’s my home defense weapon and I’m not good at reloading yet, so that is not an option).
dpete
Silent But Deadly
Posts: 263
Joined: Thu Mar 13, 2014 8:54 pm
Location: Northern WI

Re: AR-15 Subsonic Feeding Problem

Post by dpete »

How big is the gas port in the barrel? My 8" barrel SBR had the same issue until I opened up the gas port to .108". Its primarily a sub gun and for shooting supers I can turn down the gas with the adjustable gas block if needed. The other thing to check is if the subs are rubbing on the side wall ribs of the mags. I know the 300 BLK Pmags are different internally than the 5.56 mags but its something easy to check.
JBuriani
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Posts: 1
Joined: Tue May 24, 2022 2:24 pm

Re: AR-15 Subsonic Feeding Problem

Post by JBuriani »

Had a similar problem with my 10.5 inch 300 BLK unsuppressed with subsonics. After I added a LAW Folder, it would eject, but not feed, or double feed, and wouldn't lock open on an empty magazine. I read an article on Spike Tactical's Barking Spider muzzle device and ordered one. The difference is amazing; it has become 100% reliable with various subsonics, both factory loads and reloads ,and no issue with supersonics. It increases back pressure while directing most of the blast forward. I think that you'll be very happy with it.

https://www.spikestactical.com/collecti ... r-2-brake/

Jeff
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