Tuning Fx m3 impact

At higher power it makes a significant difference in improving consistency and easy tuning for smaller group sizes. Literally ALL my barrels and liners have the carbon sleeve, if anything it’s a fantastic upgrade to the stupid runner orings and that function alone is worth every Penney of the 29.99 price. I found it really helped with consistency/accuracy even at 7 FPE most likely from reducing issues with stupid spacers and orings. 




if you mainly shooting pellets then don’t bother glue it but I always glue mine just so it won’t every shift or change though eliminating it as a variable when it comes to accuracy.