This has probably been addressed before but i can't find any posts..If i switch to a 6.8 upper for my M-4 will i need to replace/strengthen the buffer spring? Or could i just use the same one as the 5.56?
This has probably been addressed before but i can't find any posts..If i switch to a 6.8 upper for my M-4 will i need to replace/strengthen the buffer spring? Or could i just use the same one as the 5.56?
You can use the same buffer and action spring.
My 6.8SPC rifles have all had either a Daniels or BCM lower from G & R Tactical, equipped with a carbine spring and H buffer.
Colt SP6920, LE6920, 6720
BCM Lower/ARP 6.8SPC upper for hog hunting
DD M4V5 clone, Troy 5.56 Carbine, S&W M&P10
PSA Lower/BCM LW 16" middie CHF upper
PSA Lower/BCM LW 14.5" middie upper
2 PSA 18"6.8 rifles, PSA 20" M16A4 clone
Remington 870, Remington 700VTR
SA XDm9, XDm9C, , XD9SC S&W 1911
Ruger GP100, Hawkeye77 Compact 6.8SPC
Kel-Tec KSG, Marlin 336 30-30, HK 45C, VP9
Sig 1911 Tacops, Scorpion 1911, M11A1, P226 Mk25
Presumably, the heavier bolt/carrier group soaks up much of the additional impulse.
I stand corrected, and thank you. Wonder why a heavier buffer, then, wouldn't make a little sense.
Guys,
The buffer and spring have almost nothing to do with the actual recoil generated by the cartridge.
Recoil is taken up by the bolt lugs and barrel extension.
The buffer weight and spring have everything to do with the gas impulse produced by the powder and gas system length.
Any upper in any caliber can be just right, over gassed or under gassed.
Odds are the 6.8 upper will cycle the same as the 556 upper you took off.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
Thank you gentlemen..One more problem solved..
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