AR Sponsor
Posted: 1/27/2010 10:59:38 AM EDT
| so i fisnished my 16 car 9mm build on a rra upper. i have the 9mm buffer and standard spring. when i shoot i can feel the recoil, and if feels delayed, like i feel the concusion from the round going off then the bolt carrier sliding back is a split second later. i don't like it, is there anything i can do? maybe a different buffer spring or one of those hydraulic buffers? i like the gun its just something different i was wondering if i could fix. thanks |
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Are you comparing it to the recoil of a .223?
A direct blowback 9mm AR has a different recoil feel - some feel it is more, and others feel it is less, while yet others say it just feels different. Lower powered ammo with a heavy buffer and x-spring can also make it feel sluggish - if it's new, it may feel sluggish until things wear in. If you want to speed up the action though, you will need to reduce the mass of the bolt/buffer (not increase it), increase the power of your loads, decrease the spring rate, or some combination of changes. A hydraulic buffer may help also as it should reduce the thump of the bolt/buffer when it hits the back of the buffer tube and will alter the feel. |
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Quoted:
so i should start with a heavyer spring because the buffer is hitting the back of the buffer tube? so that is what i am feeling that delayed jolt? The reason for the delayed jolt is because the 9mm AR uses a simplistic delayed blowback action. I don't think you will ever completely eliminate the jolt, but you can minimize it or alter when it occurs. If you want to speed up the action (feel the jolt sooner), you would want to do stuff like ramp the bolt, reduce the mass of the bolt/buffer, run reduced power hammer springs, and a reduced power action spring - you do need to be careful that you don't reduce it too much though as the effort required to cycle the action is what delays the bolt from opening too quickly after a round is fired - you need to maintain the proper balance so the action doesn't open too early or too late. If you want to slow down the action, you should leave the bolt unramped, add mass to the bolt/buffer, increase the power of the hammer springs, and use heavier action springs - again though, you need to maintain the proper balance for the load you are shooting. If you just want an overall smoother action, try an HK roller locked 94 series gun or clone. 
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