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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.

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' 🇺🇸🇺🇸

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.

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.

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!