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I found myself in need of a magazine plug for my m4 with Kip's FL mag (hunting migratory birds, mag must be limited to 2 rounds). I searched the internet, and even ordered one of those Butler Creek plugs, but it seems nothing out there is long enough (12 inches). In the end, I made my own, and thought I'd share the process in case there are others who are interested. Parts: 1) Brass tube, 13/32" (10.32mm) OD with 3/8" (9.53mm) ID by 12in. 2) Tree nut, metric thread, 9.60mm OD with 22.2mm diameter cap. 3) Wood dowel (screw type), 3/8" OD. [ATTACH=CONFIG]911[/ATTACH] Process: 1) Polish tube with metal polish for aesthetics. [ATTACH=CONFIG]912[/ATTACH] 2) Insert tree nut and hammer flush (interference fit). [ATTACH=CONFIG]913[/ATTACH] 3) Insert dowel and hammer in to tube to desired length. [ATTACH=CONFIG]914[/ATTACH] Finished product: [ATTACH=CONFIG]915[/ATTACH] To fit plug, simply remove the magazine cap and insert through hole in mag spring retention clip and reinstall magazine cap. The OD of the tree-nut is about 0.8mm smaller than the ID of the magazine tube. The pressure of the magazine cap centers the plug and keeps it snug in the tube (rattle-free). No tools required for installation/ removal. See following thread for pics of installation (can't seem to post more than 5 pix per thread.)
I opted to remove the rail on my m4 and thought I'd share... -Rail screw holes are M4x.75 NOT #8-40 (8-40 is what I used, but do so at your own risk - read further) -Screws should be no more than .130" long to match receiver thickness I purchased these two plug screws, either one will work: -Brownells hex plug: 080-534-002WB $16.99 http://www.brownells.com/gunsmith-tools-supplies/small-hardware/metal-screws/hex-plug-screws-prod21185.aspx -Brownells slotted plug: 080-533-840WB $8.99 http://www.brownells.com/gunsmith-tools-supplies/small-hardware/metal-screws/plug-screw-kit-prod792.aspx Personally I thought the hex screw looked best, even though they were pricey. I was worried the hex plugs might be a shade too long as the receiver seemed to be 1/8" but they fit perfect. Other options on Brownells include a positive stop screw and a SS option. I secured these screws with Loctite 243 as it supposedly works better if oil contamination is present... and I already had some 243 from my titanium carriercomp mag install (thx Unobtanium for the 243 insight). I'm sure any blue loctite would do the job though. All in all probably a huge waste of time for this, but I like the cleaner m1 type look with the rail out of the way. Plus I was bored. [ATTACH=CONFIG]2048[/ATTACH][ATTACH=CONFIG]2047[/ATTACH][ATTACH=CONFIG]2046[/ATTACH][ATTACH=CONFIG]2045[/ATTACH][ATTACH=CONFIG]2044[/ATTACH]