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Going by model number i get this link https://discountfirearmsusa.com/Bushmaster-91022-XM-15-Enhanced-Patrolmans-AR-Pstl-SA-223Rem-5.56-10.5-30+1-Blk and that one tells me its a "Barnes Precision free-float lightweight quad rail"

Dennis, Bushmaster just lists this as the A3 Quad Rail. Bushmaster Customer Service should be able to answer exactly which quad rail is used at 1 (800) 883-6229

they just call it a A3 Quad rail please call Bushmaster to verify (800) 883-6229