CMMG RECEIVER EXTENSION KIT – W/MIL-SPEC BUFFER TUBE AR-15

Description

The CMMG AR15 is a buffer system component, mil-spec diameter.

The buffer and spring absorb the bolt carrier at the back of its travel and drive it forward again. Together they set how the rifle cycles.

Mil-spec and commercial receiver extensions are different diameters – about 1.148" against 1.170" at the threads – and a stock cut for one will not fit the other. Check which your stock is before ordering.

Buffer weight is a tuning part: a heavier buffer slows the carrier, which is how an over-gassed rifle – a suppressed one, commonly – is brought back into balance. Too heavy and the rifle short-strokes instead.

Buffer and tube have to match. Carbine, rifle and A5 lengths are different, and the wrong combination will not assemble or will not cycle.

This is a part or accessory, not a firearm, and ships directly to your address.