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RSR Stock #: RRAXBT31751B
Manufacturer Part #: XBT31751B
UPC: 842834125616

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Rock River Arms, BT3 X-Series, Semi-automatic, AR, 308 Winchester, 18" Flutted Barrel, 1:10 Twist, Hunter Muzzle Brake, Low-Pro Gas Block, Mid-Length Gas System, Hogue Rubber Grip, 6-Position Operator CAR Stock, 17" Lightweight Free Float M-LOK Handguard, Black, 20 Rounds, Two Stage Ultra Match Trigger, 1 Magazine


WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to


"GLOCK” is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. or GLOCK Ges.m.b.H.  Neither RSR Group, Inc. nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H.  The use of “GLOCK” on this page is merely to advertise the sale of GLOCK pistols, parts, or components.  For genuine GLOCK, Inc. and GLOCK Ges.m.b.H. products and parts visit

  • Hogue Rubber Grip
  • RRA Operator Carbine Stock
  • 17" Lightweight M-LOK Free Float Handguard
  • 18" Fluted Stainless Steel Barrel
  • Two Stage Ultra Match Trigger
  • Hunter Muzzle Brake
  • 1 MOA at 100 Yards

Product Description

The Rock River Arms BT3 X-Series rifle is well equipped for general duty use as well as competition use. It features a 18" fluted stainless steel barrel, mid-length gas system, RRA Two Stage Ultra Match trigger, free floating M-LOK handguard, 6 position Operator CAR Stock, and weighs in at 8.7 lbs.