Couple of notes:
Can you get the BB to over hop (lofting or traveling up) when shooting. If not disassemble the hop and ad 1 wind of electrical tape around the hop bumper (the bumper is that little part that looks like a piece of wire insulation.) Adding a winding of tape will make it a bit bigger allowing you to engage more hop. Trim off excess tape.
If you can over hop but are still getting crapy range change the bucking and clean the barrel thoroughly. CA barrels kind of blow so if a tight bore is in you future – you may want to just do that now.
Gaurder in my opinion generally blow. Go for a systema – no mods will be required for fitting either. I have on occasion just not had good luck with a ho casting. Nothing that can be seen with the eye but chrony results and field test don’t lie.
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