10-10-2011, 03:41 PM
Palmetto State Armory has a nice assortment of buffers with different weights. If you have a carbine receiver extension, you use a carbine spring. You can try your current configuration as is, and see if there are any issues. A carbine buffer might work fine, but I really prefer the heavier buffers in the Grendel. 2.9 oz carbine buffers are meant for 5.56 guns shooting 55gr with .068" gas ports, and they don't even do that so well. The Grendel is pushing 100-129gr pills with a gas port closer to or above .100", with a few more grains of powder often. It would kinda be like taking a piston from a 4-cylinder import car, and putting it in your 6-cylinder Jeep Cherokee, running higher octane fuel...not very ideal. There needs to be more weight to fight the gas impulse from the Grendel, so your bolt stays locked longer.