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Hi Stephen and welcome. While many internal parts are standard, specialized parts like the recoil spring and guide rod are designed specifically for the BBR 3.10. Important Note: It's crucial to consult the manufacturer's manual and potentially contact Rock Island Armory or a knowledgeable gunsmith to ensure compatibility and safe function when replacing or modifying parts on your BBR Compact 45 ACP. Rock Island Customer Service: Phone: (775) 537-1444. Cheers and stay safe!

If it ain't broke, don't try to fix it!!!