Bushing Screws Get Loose?

I have been having some accuracy problems… Not major.. but major for a talon relative speaking. I was getting .47″ groups at 18yrds (50ft). Kinda slowly started to get worse to that point after roughly 170 shots. Thought maybe it was parallax or me needing to adjust TH some more or PW, or maybe clean the barrel. But, I think I found the problem tonight.

I took off the hand guard and put an allen wrench to the barrel bushing screws and they were loose and not snug. I tightened all 4 and went ahead and re tightened my scope for good measure and I’m back to .18″ groups.

I didn’t check how tight they were when I got the gun so I cant comment on that, but do these screws come loose often?? Do I need to check them every 100 shots or do you all think they just might not of been snug from the start?

Thanks 🙂 🙂