Well i did it

[bigbush]

Hello everyone,I was just going to build a little 223/556 plinker and they had to go and put the 450 on sale again. I passed on it last time and couldn't resist this time. I have a rock river lower with stag lower parts kit and magpul stock. I still need a buffer and spring, has any on tried the spikes ST-SST - 7.0 oz. buffer? If not what would work in the carbine buffer tube? Needless to say I am pretty stoked to get this together and shoot it .

[2zero6]

Welcome aboard! That buffer will be plenty fine as I believe Bushmaster uses around 5 oz IIRC, but the system was designed to work with milspec. I run a Duostock with an M4 buffer.

[bigbush]

I havent bought one yet, If could use a standard h2 buffer that would be cool since i will probably use the lower for my future 556 upper also. Also it is a mill speck tube if that's what you meant..

[2zero6]

I havent bought one yet, If could use a standard h2 buffer that would be cool since i will probably use the lower for my future 556 upper also. Also it is a mill speck tube if that's what you meant..

Same thing I do with mine, I love being able to swap calibers with just an upper.