jtallen83 Posted December 20, 2018 Report Share Posted December 20, 2018 Interesting tool, coming from X-caliber doesn't give me the warm fuzzies though. If they made it well balanced then it should work fine but seeing that 1/4 inch drive on the end makes me wonder if there will be any wobble while lapping. PTG's lapping tools are $25 each and perfectly balanced. That and lapping tools are an expendable tool so eventually you are left with just a wrench. http://www.x-caliber.net/bart-20 Quote Link to comment Share on other sites More sharing options...
COBrien Posted January 10, 2019 Report Share Posted January 10, 2019 (edited) I have a hard time wrapping my head around clamping the round "head" of the lapping tool in a vise. No flats, no knurling, nothing. Just clamping your serrated vise jaws onto a "precision ground" tool. Personally, I'd prefer a MagPul BEV Block and a PTG lapping tool. Granted, this won't work for "AR-10s" (am I the only one irrationally annoyed when companies generalize the term 'AR-10'? But I digress...). But a set of vise blocks for a .308 AR and a PTG lapping tool are still substantially cheaper than this... thing... Edited January 10, 2019 by COBrien Quote Link to comment Share on other sites More sharing options...
Ravenworks Posted January 11, 2019 Report Share Posted January 11, 2019 The lapping tool I got from Brownells was $50. And the tool that went into the receiver and lugs had flats for the vise end and it was $45 Quote Link to comment Share on other sites More sharing options...
Ridgewalker Posted June 8, 2022 Report Share Posted June 8, 2022 The BART II tools I got, one each for a Spec AR15 and a Aero M4E1, both had flats, and both worked well. The Aero M4E1 BART ll version also appears to fit the Seekins iRMT-3 uppers. Haven't tried it yet, probably will give it a whirl soon though. The instructions say to do it horizontally and not on a drill press, however I did do it vertically, but from below to keep the compound from running into the receiver. I also did it with a flexible shaft between the tool and the handheld cordless drill to help it run true and not induce a wobble or put uneven pressure on the face. I cleaned the receiver and tool with Hoppes then alcohol every time I pulled it out to check progress, which was often. Re greased and put more compound on the tool face every time too. I suppose the face trueing end will eventually wear out, but it will be on somebody else's watch in my case. When I do some some 308ARs later this year I will be buying those versions too. Quote Link to comment Share on other sites More sharing options...
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