AAP-01 Hex Outer Barrel - Partner Product Colour:Black The inner barrel also fits

The inner barrel also fits more tightly than the original meaning more consistency in every shot

You'll never have to reload again

This and our picatinny rail are MUST HAVES if you run a MK23

28g BBs are available in three sizes

at bottom and in center of housing to ensure the hopup unit is exactly centered

AAP-01 Hex Outer Barrel - Partner Product Colour:Black The inner barrel also fitsThe AAP 01 is a great sidearm, but the stock outer barrel isn't as stable as it could be (especially when firing on full auto). Enter the Project Airsoft AAP 01 Hex Outer Barrel. This upgrade outer barrel fits much more snugly into the upper receiver of the pistol meaning less movement and more accuracy. The inner barrel also fits more tightly than the original meaning more consistency in every shot. Compatible with the original front iron sight, this