Bren2 Brace

Bren 2 Brace! Designed for use with my Bren 2 Brace Adapter, but can also be used on a standard AR buffer tube.

NOTE: This is a heavily modified remix of the CTRL+PEW Brace!

Features attachment points for up to a 2" sling, or a QD mount. Ratchet action uses a ball bearing (optional) to click into place.

The thin profile of this brace enables the factory Bren folding mechanism to correctly lock in the folded position. The original CTRL+PEW brace was to thick side-side to enable the latch to catch.

Parts List:

1x M4x16 screw >> If you're using the solid brace adapter, you will need an M4x40 screw instead!

1x M5x25 screw
1x M4 nut / nylock
1x M5 nut / nylock
1x 3/16" spring washer

optional:
1x 5/32 chrome ball bearing
1/2 ballpoint pen spring (or equivalent)

The ball bearing is OPTIONAL because you can just tighten down and the friction of the spring washer will hold it in position, depending on your preference.

I found printing with a brim and tree supports works better, but you still have some cleanup to do after the supports are removed. A bit of careful sanding with an emory board, small file, or simply scraping with a hobby knife should clean it up.

The pics show how to install the M4 nylock washer in the hollow of the brace adapter. Simply install it without the brace, and it will get drawn into the cutout. Then you can assemble the parts with the screw being careful not to force the nut back out. Using a magnetic pick-up tool will greatly simplify installation of that nut!

I've tested the hinge to breaking, and at 50% infill / 0.1 resolution, you have to REALLY crank down to break it. As in, leaning fully on the hinge to crack the plastic. So for NORMAL use, it appears to be more than strong enough at 50% infill. You can of course add more infill depending on your preferences :)

When using my brace adapter, Length Of Pull (LOP) is just at 12.5 inches, below the "recommended" max of 13.5 inches.

This brace will also fit on an AR buffer tube as in the pic. You can replace the M4 screw with an M4 "soft tip" set screw - the kind that has a plastic tip. This will avoid damaging the finish on the buffer tube! If it proves too tight to fit on your buffer tube, you can lightly sand the interior to get it to slip on. OR you can increase scale to 101% and reprint.

Thanks to CTRL+PEW for the original buffer tube design!

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