Barrel profiling

There are probably a reasonable handful of people in this country who profile barrels in house and I do a modest number for ourselves and occasionally others RFD’s, however I always think it is rather special when I profile something out of the ordinary such as this one.

This is a dummy barrel to check the profile of a barrel destined for a Colt XM177E2 replica build, the only difference being the original barrel was 11.5″ in length and this one is 12″ to keep the build within the UK 12″/”4″ laws, or barrel length not less than 12″ and overall length not less than 24″

Why the test run? Well as much as I have confidence in my programming it is always nice to run the part in a soft metal first to confirm fit and this run exposed a tightness where the front sight base (FSB) fits which is annoying as I am good to the original drawing, albeit at the upper end so the FSB must be on the tight side and we have a stack up of tolerances. I will modify my program accordingly.

This was nice to machine as I did not need a steady due to the short length. Cycle time was a very steady 21 minutes and a few seconds and I will need to increase my feed speed on the finished article to leave some machining marks as the original would have had.

Chamber will be 5,56×45 NATO and it will be attached to an A1 upper and skinny hand guard.

Next job is machining the muzzle device which is a flash hider/sound moderator combination.

EDIT – In case you were wondering what an XM177E2 is I have attached an image from http://retroblackrifle.com/ who are my go to on-line reference for such things (Hope you don’t mind guys!)

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