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Decimator/DecimatAR with OEM barrel (self.help)

submitted 1 month ago by hogleg to c/help

8 comments fedilink hide all child comments

I have been incapable of finishing a decimator build with an OEM barrel; 2 different OEM barrels as a matter of fact.

I've reprinted the upper twice (once because I wasn't sure if I just really messed up the print, once for stripping barrel nut threads) and I've reprinted the barrel nut 3-4 times at this point.

I started this build just before fosscad was nuked, and since the Ark is back up (https://forum.guncadindex.com/c/ark@fosscad.io), I was able to see that there are threads where others have had this issue.

Has anyone overcome this issue personally? The build looks great and I love the AR fcg but I'm hitting a wall here. Should I just drill and pin the barrel nut with a couple of set screws?

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[–] hogleg 2 points 4 weeks ago

I wanted to make sure I updated this for anyone following down the road. I didn't realize what the problem was until I printed the actual R2 Galileo barrel nut and compared; the hole for the barrel on the R2 was much wider than the Decimator v3. I dropped a 23.2mm negative cylinder into the center of the Dv3 barrel nut and it resolved the problem. I've not got any experience with printed barrels to compare, but I imagine their OD is narrower than the widest portion of the factory barrels I was working with.