13.5 LH Thread Cleaning Tap

thingiverse

The threads on a standard MPX barrel have approximately 3 millimeters of thread and a taper for interfacing with Sig's proprietary taper mount system, which is integral to the barrel itself. This ensures that Sig firearms are highly compatible with Sig muzzle devices, and vice versa. Unfortunately, I'm having mine re-threaded right now, thanks to Sig. In any case, I couldn't wait to fire it suppressed, so I installed my HK Parts 3-lug adapter, which has almost an inch of exposed thread. There was a considerable amount of thread left over in front of the muzzle. I knew it would become somewhat dirty, but boy did I underestimate how tough it would be to clean. This is a tap designed for cleaning out threads. If you print it in metal, it might work for actually creating new threads, but that's not what this tool is intended for. I also don't claim credit for the 13.5 LH drawing, but that's what this was loosely modeled after. I'm mostly uploading this to illustrate a concept of bringing a reasonably accurate, custom-designed, purpose-built tool into production in your own home, but if you're in the same predicament as I was, I'm glad this can be of help! Print Settings: Printer: FFCreat0r Rafts: No Supports: No Resolution: 100 microns or less Infill: 80-100% Notes: If printed in PLA, be mindful of the quick heat generation of friction, which will rapidly degrade this tool's performance. I haven't tried it with ABS yet. PLA seems to hold more of an edge, so that's where I started. Custom Section: Before... No visible threads After. Threads nearly all the way to the end are visible again! I soaked in Hoppe's #9, went at it with a fresh 3D printed tap, burned off the threads, then repeated the cycle until all the carbon was removed. I also had to use some wire brushes on a drill and a small flathead screwdriver at the front end of this muzzle device, where the most crap had built up. Works great with HK 3 Lug Knob! http://www.thingiverse.com/thing:1733574