An HK91 was the second rifle I ever bought, maybe 30 years ago. It's my favorite all around. I've never owned any of the clones, so my comments are on the HK.
I had a Century Arms PTR and didn’t really care for it. Bruised my shoulder worse than a 12 gauge and was picky about the ammo it ate. Also pretty front heavy.
TIGHT into the shoulder turns the slam into a strong shove. A rubber stock end helps, too. Mine would fire anything the right shape. It is a heavy beast.
Most inaccurate thing I ever shot. Absolutely uncontrollable. Until one day at the range some random dude asked if he could try it. I told him sure, but you'll be lucky if the round hits in the same zip code as the target. He walks downrange, lined up half a dozen bic lighters, walked back, sighted in (this one has iron, no glass) and with me laughing my as** off, moves down the line from left to right. Did not miss once. I wasn't laughing when he handed me the rifle back, though. Knowing now the rifle was dead nuts accurate, I finally learned to shoot it. Honestly it was a lot like that scene in Lethal Weapon where the guy shoots a smiley face on the target.
What are actual HK91s bringing these days? I remember them being relatively affordable, at least as far as HK rifles rifles from the era go.
I paid about $900
North of 3K, local shop has one for $3900.
They have a fluted chamber so kiss the brass goodbye anyway
You'll never find the brass. It's in the next county by the time it hits dirt. If you do, it will look like an ogre chewed on it.
All this is based on owning an original. The clones probably vary in quality, fit, finish and cost.
Mildly relevant Lethal Weapon clip I mentioned above: