AR15 Brass Catcher

This is a Brass or shell catcher for AR15 style rifles.  I'm not a fan of sweeping, so this is a great option.  The unit consists of 2 main parts.  The catcher and the clamp.  Obviously not all lowers are created the same so you may need to remodel the clamp to fit your lower, this was designed to fit the M&P Sport.  The catcher has a pivoting deflector that rotates on a 4mm bolt about 50mm long to help slide it into the dovetail clamp mount if you have a quad rail like I do.  There is a printed detent that holds it in place during use.  

 

I've tested this with hundreds of rounds in quick succession and found not even a hint of melting from hot shells so no need to worry!

 

Function video found here

 

The clamp requires 3x m3 screws.  1x m3 x 20mm for the left side clamp to act as a stiffener, the other 2 are m3 x 40mm long used to clamp the 2 halves together around the magwell.  Once snugged down you can leave this on the rifle as it doesn't add any additional bulk.  

 

The brass catcher has 4 parts, requiring 2x m3 x 10mm long screws with low profile head, and 1x m4 x 50mm screw for the hinge.  The dove tail block gets screwed to the lower catcher body, you could glue it as well, use short screws for this as the more they stick out inside the more they will get in the way of the casings you catch.  The small detent plate gets glued to the front inner portion of the deflector in the similarly shaped indent.  

 

Update 7/25/25, I have designed a more universal clamp to accommodate the different magazine wells, called the “ uni clamp”.  The clamp can be printed in horizontal or vertical orientation.  It requires 1x m3 x 20mm socket head screw for the stiffener in the left side, and 2x m3 x 30mm screws that tighten the two halves together.  They should be finger tight as snug as they thread into plastic alone.  

 

Update 8/28/25 Added a printable hinge pin to replace the m4 bolt used to hinge the lower and the upper.  Print the pin 100% it's a snug fit and has a small hole in the end for a piece of filament or paperclip to retain the pin in case you drill out the holes.

 

Update 9/5/25, Sorry, i thought I added the additional “uni clamp, and printable hinge pin” but I made a mistake.  the files for those now have their own print profiles attached to this.  sorry for the confusion everything should now be available.

 

Note: to minimize slipping between the mag well surface and the inner surface of the clamps, I recommend using an adhesive rubber pad on the clamp surfaces.  this will increase grip and friction against the clamp and the mag well.  plastic and metal are both hard slippery surfaces, it's up to you to decide what works best in your application.  alternatively, you can also “coat” the inner contacting surfaces of the clamp with a rubber cement like E6000.  let it dry completely, that coating will act as a rubber pad between the two surfaces.

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