My 21SF is using a captive 25lbs spring. The barre is the actual "Authentic .460 Rowland". When I was running the gun as a .45 Super without a comp using a Storm Lake barrel I used a non captive 24lbs spring. The group was shot at 25 yards from sandbags. This is 5 shots. When I had the guns as a Super I fired a 10 shot group that was just a hair over 1". Regardless the upgraded barrels make a huge difference in accuracy. I have had a slight issue with the ambi frame and Glock is going to replace it with a standard Glock Rail frame. Once I get it I am going to scope it for some 100 yards groups. I am expecting no more than 3". reflex264


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.264 barrel current number of shots:2122