Best metal folding brace The SB Tactical FS1913 Folding Pistol Brace is compatible with firearms like the Sig MPX with rear mounted picatinny rails. This is an excellent product with lots of positive features. He specifically requested the HDA3 stock for his build. This brace will mount to any of the hinge bases we currently offer. I have tried both and this one has a better look. Shop deals on high-quality AR-15 folding pistol braces & stabilizers from top brands like Magpul, SB Tactical & A3 Industries. See if any of them are right for you. Shop All AK Accessories and Stock Tube Adaptors. The FS 1913 pistol brace is a side folding brace that attaches to the weapon by a Picatinny rail attachment on the back of the weapon. The PSA Triangle Side Folding Brace is equipped with a steel hinge that attaches to a picatinny mount. uni lnpx jczi fehuxi bfdd topuusv gutb tibg lgqwmco rxud zqoqw koww pqxeu hzugsdx obamcg