That's what I was looking at, using an h3. 223, M193 and M855 5.56, and Black Hills MK262 with no issues over 4 years of usage. AR15 9mm Conversion Kit (2) Barrels (11) Bolt Carriers (3) Buffer Tube Kits. By just using an H3 buffer, I run 55 grain. 223 The 300 AAC Blackout cartridge gives performance very similar to the 7.
Using an adjustable gas block may require tweaking when switching ammo. 308 Carbine which has the deeper AR-10 platform receiver extension tube running an H3 buffer firing 175 Gr. Taccom 10 Reduced Recoil Carbine Length Buffer Spring For AR15 Style 5.56/. I run 10.5' and 11.5' sbr's using H3 buffers. (Use our “ORANGE Spring” NOTE: If you have a seriously overgassed. 308 Carbines using standard 7″ M4 extension tubes and short, stubby buffers. Armalite, Noveske, LMT) using deeper extension tubes and standard length carbine buffers to accommodate the longer. 500 Beowulf, and assorted “Thumpers” using standard 7″ depth M4 extension tubes. It may take some wiggling to get it past the hammer (which should be cocked), but it does come out. Once the head of the buffer clears the plunger, grab the buffer and pull it and the spring out of the tube.
“RED Spring” EXTRA Power Buffer Spring, Best option for 16″+ 5.56 barrels with carbine length gas system platforms with standard front sight towers and H buffers, 16″ + BBL gas piston guns, *some* suppressed shorties,and later generation Colt LE6920’s, 9mm, 6.8 SPC, 6.5 Grendel. Depress the plunger and the buffer spring will push the buffer out of the tube.
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