The modifications on your sl8 does not necessarily improve the rifles actual accuracy does it? I mean the ergos and all that fun stuff is now more suited to you. But it should shoot just as well with the standard stock, no? I tried one recently at csc, the trigger is not bad and I honestly dont mind the thumbhole stock. And I have seen reports of them going 1 moa or slightly better with good ammo. Let's be honest a semi auto sapr? Current prices at some places are 2100-2300, I don't think anything out of the box at that price point that's non res can match that level of accuracy. Now whether that accuracy is a part of the role you want out of the rifle is a different story.
I'm not sure what your trying to say since you didn't actually say how it shot when you tried one recently or if you even liked it. Only that you didn't mind the thumbhole.
So,
No, the mods don't make it shoot any more accurately, what they do is make it more comfortable for the average person as most of the complaints about it are the thumbhole stock doesn't fit everyone.
Yes, should shoot just as well as a stock one which is very well with most ammo and really well with a few select types and better when you spend some time developing a handload for it. Mine is doing just a tiny bit over MOA with a couple factory loads and my handloads. I'm hoping for better out of my latest batch of test loads.
SAPR? No. A sporting rifle that shares many of the same characteristics and is a civilian less scary looking version of the G36? Yes.
Agree'd, average retail for new is $2200-$2300, used are a couple hundred less.
Is that accuracy a part of the role I want? I think most people want their rifle to be as accurate as possible at any price point.
Judging by the whining on this site about how every rifle out there people buy in the $2000 or higher price range that should somehow automatically be a sub MOA rifle I think I'm right about most people wanting the most accurate rifle available regardless of it's role.
Out of the box I don't think there is anything non restricted that can touch the SL-8 for accuracy. If you throw AR's into the mix then it takes a higher end AR with a quality barrel to match it. Spend $2000 on an AR and you will easily shoot just as well as the HK, maybe better. Either way, it takes quality ammo and a good shooter to see the difference. It really comes down to what a person wants and how much they are willing to spend to get there.
Don't get me wrong, I love my AR's and will own at least one of them (currently have 3) until the government takes them from me but for a non restricted so far from all the black rifles I've owned or shot the HK is the best option out there in my opinion. For me it takes a few mods to make it the way I want it. My next rifle is going to be an ACR and then get a non restricted barrel and have it reclassified. I'll be keeping whichever one I like better.