Made of STKM13C.
PDI New products is High Precision Wide Bore Inner Barrel.
We desined a tight bore barrel & get so much reputations in this industry.
This time we try to proceed new concept. It's a WIDE bore.
PDI recommended using 6.08 dia to get a distance, the clearance inside of the barrel & projectile will support making good airflow.
So this time, we make a wider new dia 6.1+.
This + means same as RAVEN, not precise as PDI Stainless steel brand (6.01, 05 & 08)