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Transplanting an hk piston assy

3827 Views 8 Replies 8 Participants Last post by  CoolHandPuke, 
C
This may sound nuts... Has anyone ever built an AR using an American barrel, lower receiver and upper receiver but retrofitted the HK piston system (gas block, piston assy, barrel nut, 'channel' tube (metal cylinder which passes through the upper, providing a channel for the piston rod to go through the upper receiver and impinge the bolt carrier), and bolt/carrier assy?Looking for a project!Thanks!Charles
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Grumpy
It would probably cost more then simply buying an MR556 upper due to the amount of work that would have to be done to the barrel, modfying the upper, having a custom barrel nut manufactured, etc.

And good luck finding hand guards that fit.
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