Quarter Circle 10 has introduced a new weight adjustable buffer assembly for the AR-pattern blowback operated pistol caliber carbines. The buffer comes with four aluminum, four steel, and four tungsten weights, as well as four rubber spacers. Having that choice of different material weights you can assemble the buffer to weigh from 5 oz (without any weight installed) to 11 oz (with all tungsten weights) and everything in-between. By choosing the proper weight combination you can adjust the overall buffer weight to flawlessly work with the caliber your PCC is chambered in. It will also be handy to adjust the weight for use with a suppressor.
Quarter Circle 10 also provides a chart (see below) which will help to estimate the proper weight for your particular PCC.
In order to make the weight change an easier process, the buffer has the polymer tip/bumper retained by a set screw instead of a roll pin. This feature allows using the provided Allen wrench to remove or install the bumper much easier and faster.
The buffer is made of 8620 steel and has a QPQ nitride finish. It is a drop in part designed to be used in carbine length buffer tubes only. The new buffer is available through Quarter Circle 10’s website at an MSRP of $120.