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It was delightfully vague, wasn't it? Sorry about that, a problem well stated is a problem half solved, and I left you at square one, didn't I?
AP, good call- it is a Grunig, in .308. And thanks tiriaq, I'll follow up on your suggestion. The reason I asked is that a recent post here got me thinking that my eyes aren't what they used to be, and that just maybe, a scope is the way for me to go to get into the longer range stuff. The Central sight I use is good enough that I can consistently hit the gong at 375 yds, (as long as it's freshly painted day-glo) but at that distance, the approx 18X24" gong is just a dot.
So I started thinking scopes, but I know zip about them, and the grooves on the receiver side wall that the Central sight base mounts to had me wondering if that was a possible side mount location for a scope. Good to know I can top mount.
I know it's a good rifle and deserves a good scope, but paying for one could get interesting... might have to sell something, lol.
Anyway, it's all new to me, and I'm looking forward to learning more.