Just finished building this 300 Whisper/Fireball. She shoots like a dream. The first 4 rounds (220 gr SMK Subsonics) down the tube went into .875 inches at 100 yards. Things got better from there. Groups are averaging around .625 with my home-rolled subsonics. Cycling is flawless. John Noveske is the man!
Here's the specs:
Noveske 10.5 inch 1x8 Twist barrel
CMT Upper
DD 9.0 Forend
Young Manufacturing NM Bolt Carrier
CMT MP-Tested Bolt NP3-coated
PRI Gasbuster Charging Handle
GG&G 20 moa GS-1 Rail
ARMS #22L Rings
Leupy 3.5x10x40 M3 MilDot
SWR Omega Suppressor
Oly SBR lower
CMC Single Stage Match trigger
MIAD Grip
Standard M4 Buttstock
H-Buffer
Threaded Mode