Sig MPX 9 Magazine Loader

thingiverse

With the availability of replacement magazine floor plates, team Scorpion Evo has held a slight Thing advantage in the highly-competitive world of 3D printed SBR PCC (pistol cal. carbine) aftermarket accessories -- until TODAY! Introducing the integrated clip and spoon speed loading system for the MPX! Featuring: Xtreme "clip" asymmetric chamfering to make sliding inbetween rows of rounds painless, even on the most tightly packed ammo boxes! (see second render pic) Additional chamfering on the end of said clip to facilitate quick loading of cartridges into the clip Edge blends on the inside of the "spoon" to assist in printing vertically (current recommended orientation) Moar chamfering on the edge of the spoon to make it easier to jam it onto your magazine Compact enough you won't even notice it in your range bag Smooth, clean appearance, with flat surfaces to Remix with your own logo! Why fumble with hand loading cartridges from factory packaging, when that same packaging actually sets you up for quicker mag loading with the use of this Thing! Be the envy of your friends, fill your mags at the range before they can even reload!!! See? That 3D printer was totally worth the investment. Download and Make today! [/marketing] In case you're wondering, the "LDRCF" version has my school centerfire rifle team's logo on it! I shoot my new SBR at 2-gun in hopes to replace my conventional AR-15 in 5.56x45 with a solution that is cheaper to shoot and very similar for matches under 100 yards. I calculated it would pay for itself in 5k rounds, but then after I bought it, and got the tax approved to make an SBR I realized I goofed with the math and it's actually 8k rounds... that's before the tax and mags and stuff...shhh! But glad I did it because I love this nimble little gun!!!! Can't wait to suppress it :D Print Settings Printer: FFCreat0r Rafts: Yes Supports: Doesn't Matter Resolution: 200 micron (or better) Infill: 100% Notes: Print "LDR_MPX_9_1.1.stl" at above settings. Picture shows recommended print orientation. I recommend ABS since this will most likely be used outdoors, and if you leave it on a table in range of the sun, it will warp beyond use. Don't forget to scale for ABS shrinkage! I scaled to 102%. Raft is also recommended since the bottom is quite thin because it is chamfered to facilitate insertion onto magazine. Finishing First a review of terms, should you need them: Magazine - Box that feeds cartridges into somethingClip - No, not the high capacity assault clippazines MSNBC hates so much, this is a device used to load cartridges into a magazine, these days commonly seen in the form of "stripper clips". The venerable M1 Garand used them extensively as well.Spoon - A term for a piece of stamped metal (or plastic I guess) to temporarily mate the clip with the magazine and allow the transfer of cartridges. Since 9x19mm is much shorter than conventional AR-15 cartridges, the 5.56x45mm, scaling my AR loader down to 9mm seemed like it would result in tumbled/jammed rounds in the chute, so a better approach, remixed from Reyer's design, is to combine a clip and spoon into one unit. Not like 9mm comes on clips anyways. TL;DR This design is similar to a clip and spoon combined! Finishing (for real) Allow to cool evenly if using ABS. Remove raft. Now here comes the tricky part: Try to cut so that it is as wide as possible at the case rim, then notch out the rest. Take a piece of spent brass, actually a steel case will probably work better, and cut it in half, such that the largest part of the diameter remains at the middle, (basically, remember to compensate for the kerf width of your cutting tool of choice) otherwise this won't work as well. It is to be used as a finishing tool. Cut a slit as shown to remove the half. Resist the urge to sand/file it. You want it as sharp and nasty as possible. Hopefully it's still hot from the friction, if not, reheat it with a blowtorch or I guess a Bic lighter will do. It shouldn't be red hot or anything like that, but just enough to kind of help the shaping process of the plastic. You don't want it to be hot enough to easily deform the plastic as you attempt to move it in a straight line down the clip. Use needle nose pliers, and this makes a nifty finishing tool! These Russian copper washed steel crap cases keep a nice sharp edge! Don't have a single spent case lying around? Really? Not even ONE??? You could carefully try to scrape out the pathway with a knife, and then shove rounds through it while not connected to a magazine to try and help wear it down. I did this before I thought of the, "cut a case in half and shape" method. Word to the wise, using a spent case as a cutting tool works infinitesimally better and is dead simple. Use Usage Slide 5 cartridges in, straight out of a row of a box of ammo (all my ammo is in bags otherwise I'd demonstrate) or single load from a bag, though the biggest efficiency improvement is definitely with a conventional 50 round box packaging. With it mounted on a magazine, ram them in using a hard surface like a heavy table or railing. Try to push up to make up for the curvature of the mag (this would work perfectly with straight Uzi mags or something) and try to keep the inside flush with the mag lips. Push from the mag, slightly upwards, applying downward pressure with thumb. I had difficulty loading to 30 rounds, but maybe my magazine springs are stiff. The rounds start to bend their way out of the "clip" channel. Loading up to 20-25, this works beautifully!!! I think I'll make V2 with some way to keep it flush on the feed lips, and a longer guide to stop cartridges from peeling their way out when under a lot of force. But I would like to get a gen 2 magazine (if Sig ever releases the damn things.........) to see the differences in the feed lip area. If you have an MPX or a 9mm AR that takes these magazines and have been waiting for something like this, please try it and let me know what's good and what needs improvement!