Originally Posted by
bp7178
Yes, heavier buffers will slow the velocity of the bolt carrier.
If you slow it too much, you can induce problems. Fail to lock on an empty mag being one, fail to feed etc. Some of these can also be magazine problems, so if you're testing use the same magazines throughout any testing.
My advice would be to buy an H3 buffer, which has three tungsten weights. This is opposite a CAR buffer which has three steel weights. You can swap them around to make an H or an H2.
Ammunition will also effect this too. So test your setup with all ammunition you foresee yourself using.
The heavier you make the moving assembly, it will change not only the recoil on the rear stroke, but forward as well.
The A5 setup is a little different, as it uses a rifle spring which has a different spring rate than a carbine spring. The A5 system uses a heavier buffer than a typically found in carbine setups, 5.33oz with the stock buffer.
Just food for thought.