I have just dropped a VSR barrel into my M4, seems to be working well. The bucking sits slightly further back compared with the end of the barrel because the retention groove is closer to the end compared with stock. I will be fixing that on the lathe but a person with a good rotary tool and steady hands could easily do the job. Much easier to modify then an AEG barrel.
It will be getting an IR-Hop soon and possibly playing with bending the barrel a little.
My hope is to push the accuracy out to 70-80yds or so with .4g BBs.
-Grant
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