My Barra 1200g, I think I love it

So I've had this thing for about a month and in the beginning there was problems but with that being said the customer service is hands down the best I've ever dealt with it came with a pre-installed scope stop which broke (because of my heavy setup) so I drilled out the receiver modified a rail adapter and that fixed that problem but I got about 100 -120 shots into it and noticed that my shot group was getting bigger and shifting high and right, well that's because the sleeve over the barrel with the integrated air stripper/brake was sliding forward so I cut the and end off did some doing and attached a pws 556 brake to the .22 barrel added some side and an under rail and it shoots like a dream. I have only ever run slugs through it 23 grain h&n and 25 grain Olympia shot in .22, 25 works best for me at 40 yards and in .177 I've only run 16 grain h&n slugs which work great. I'm gonna get some 10 and 13 grain h&n slugs in .177 to see how they run and I've also got some 18 grain .22 on the way to see how they run so when I'm less busy here in a week or so (and get my yard work done) I can take them back to 50 and 100 and do some accuracy testing