If it doesn't work well do u blame it on cheap components or the cartridge
Egh depends on what's not working.
Feeding issues ? .22-250 is WELL known for not wanting to work in gas gun. Even the nicer ones have feeding issues. Now there some that have a good record for working but I'm not dropping 2k on a rifle to shoot a round that... honestly .... I'm not super crazy about . Just not gonna happen .case design just isn't the best for a gas gun plain and simple. At that when a wel documented deal that's fairly specific to the cartridge in a certain system is happening...then yeah id blame the cartridge... For the most part.
Accuracy issues? Well that can go either way. If I bore scope it and it and the barrel looks like a gravel road the the crown is chipped....yeahhhhhhhh that cheap parts .... If I try and use a 63gr bullet in it and the twist rate of for like a 55gr MAX .... then yeahhhh that's the ...well no really poor parts per say but just the nature of the beast . You can only push so much in a given twist . Would be like getting upset my pack goat can't keep up with a pack mule . It's like duh can be the most high grade whatever but it can only do so much.
Build issues ? .... Look.... It's a complete friggen upper I bought with a coupon for $216 shipped..... Like ..... Come on it's definitely not gonna be THE BEST . Will probably be over or under torqued here or there stuff might rattle a lil ect... I'll probably take it apart during my inspection and reassemble it ... because....again... $216... For a complete upper ... Like some of my barrels are more then that . I'd be an IDIOT for thinking there probably won't be any issues. Like there a point where you just been to be kinda self aware. I really really really doubt I'm going to take this out the box and it just work . But I'm perfectly fine with that ... Kinda the whole.point of getting this and not just a bolt gun that just works
Anyhow just depends what messes up