APF RI451M is a .450 Bushmaster AR-15 pattern rifle build featuring an 18-inch E.R. Shaw barrel and a 15.5-inch M-LOK handguard, paired with a Luth-AR stock and a nitride BCG. It’s configured for shooters who want a compact, modern handguard layout with a built-in .450 Bushmaster cartridge platform.
Key Features
18-inch E.R. Shaw barrel chambered in .450 Bushmaster
15.5-inch M-LOK handguard for flexible accessory mounting
Luth-AR stock for a stable AR-style shooting platform
Nitride BCG included for improved corrosion resistance versus standard finish options
10rd magazine capacity configuration as provided
Build-ready and cartridge-specific, APF RI451M is a solid choice for .450 Bushmaster enthusiasts looking for an 18-inch AR-15 pattern setup.
