Hi Eric and welcome. The brace is a Magpul BTR brace which is a Mil-Spec version as shown in more detail here: https://magpul.com/btr-arm-brace-mil-spec.html?mp_global_color=118 -------------- Cheers, stay safe and enjoy!

Yep, the brace is adjustable. It is a Magpul BTR brace on a milspec carbine buffer tube. The SBA5 brace is compatible with the radical arms AR-15 pistol.

Yes indeed the radical arms brace is adjustable. It is a Magpul BTR brace on a milspec carbine buffer tube. The SBA5 brace is compatible with the radical arms AR-15 pistol.

Good afternoon to you!! The Radical Arms Model: RF01864/FP105556M410RPRBTR
Bud's Item Number: 181923
UPC: 814034029544 is equiped with a Magpul BTR brace. It can be adjusted for lop and generally comes with a milspec carbine buffer tube. The firearm is compatible with the SBA5 brace which fits the milspec carbine buffer tube. Hope this helps. Have a good rest of your day.
🇺🇸🇺🇸 'Merica' 🇺🇸🇺🇸

The pistol is equipped with a Magpul BTR Brace.
Adjustability: Yes, the Magpul BTR brace is an adjustable stabilizing brace.
Buffer Tube Type: The pistol generally comes with a slotted Mil-spec diameter carbine buffer tube to accommodate the adjustment positions of the brace.
SBA5 Compatibility: Yes, you can add an SB Tactical SBA5 brace to the buffer tube. The SBA5 is designed to fit on standard mil-spec carbine receiver extensions (buffer tubes).
The Magpul BTR brace is designed to offer enhanced stability and ergonomics, similar to the SB Tactical SBA3 or SBA4 braces.