The BT21 Atlas TRG Bracket (ATB) is designed for use with the Sako TRG line of rifles that utilize the TRG bipod attachment slot with 0.42" hole spacing. The ATB provides a forward mounting position which is also closer to the bore-line.It is designed for use with either the 2-screw clamp (BT10, BT65, BT69, BT72) or quick detach lever (indicated by "LW17") models of Atlas Bipods, which would mount directly to the Picatinny Rail portion of the ATB.Although the No Clamp (NC) models can be mounted onto the ATB, it requires installation of the bipod during the installations of the ATB prior to reassembly of stock. THIS RESULTS IN A SEMI-PERMANENT, DEDICATION OF THE BIPOD TO THAT PARTICULAR RIFLE.The ATB is constructed from 6061-T6 Aluminum with a Type III hard anodized finish and heat treated alloy steel with a Manganese Phosphate finish. Available in black only. Fasteners included: two (2) M5 - .8 x 10” flat head socket cap screws, two (2) 10-32 x 3/4” flat head socket cap screws and two (2) 10-32 x 5/8” flat head socket cap screws

• Length: 3.83"
• Weight: 5.03 ounces

The BT20-B Atlas Accuracy International Spigot Bottom Rail is the same rail found in the BT20, but consists of the bottom 1913 rail ONLY. It attaches to the bottom of the BT19 AAIS via blind threaded 10/32 holes and has a two hole pattern of 1.100" (see third image).To utilize the quick detach lever on our “LW17” style of Atlas Bipods OR the 2-screw mount style of Atlas Bipods, it is compatible with the following:• Any ARCA clamp with a matching hole pattern. We offer Area 419's ARCALOCK Clamp separately OR together as a complete unit: BT20-B/ARCALOCK Clamp (see fourth image)• Any Picatinny clamp with matching hole pattern. We offer American Defense's ADM-170-S separately OR together as a complete unit: BT43 Leveraged Rail (see fifth image)• Arisaka's Picatinny Rail SliderMachined to Picatinny rail standards from 6061-T6 aluminum with Mil-Spec Type III Class 2 finish. Available in black only. NO HARDWARE INCLUDED. 10-32 x 3/8" Flathead Socket Screws available separately.

• Length: 1.60"
• Weight: 0.57 ounces