HK USP .40 Full Size To .357 Sig Conversion Barrel.

Each barrel is made from 4140R steel, heat treated and finished inside and out in the ultra-desirable nitride finish. Some have had issues with this conversion barrel with factory mags. RCM RECOMMENDS THE JET FUNNEL USP 9MM 17 ROUND MAGAZINES. THEY WILL HOLD 15 ROUNDS OF THE 357 SIG AND PERFORM 100%. THE DESIGN OF THE MAG LIPS IS WHAT MAKES IT FEED CORRECTLY.
  • Traditional button rifled bore for use with jacketed and non-jacketed ammunition
  • 4140 stress relieved & properly heat treated steel
  • Micro polished feed ramp
  • Machined to exact tolerances for proper fitment
  • Overall length 4.20″
  • Finished inside and out in the “Nitride” process for enhanced service life
  • Not for use in the USP Compact models

8 in stock

SKU: RCM-GB-PB120 Category:

Additional information

Weight 4 oz