PDI Stainless Inner Barrel GBBP.

PDI inner barrels. 
Stainless Steel, 6.01mm tight bore and 6.03mm

Increase your power and accuracy with this long lasting, easy to clean inner barrel. One of the industry standards for upgrades!

F-86 recommends these lengths for these airsoft GBBP.

-97mm G17, 4.3 Hicapa 6.01mm
-113mm 5.1 Hicapa 6.01mm
-129mm AAP-01 (Not AAP-01C) 6.03mm

Pair it up with a Maple Leaf hopup rubber for the best accuracy you can get!