Rifles
Johny
Buy the best you can, other wise you will be changing in short order, best to buy once or at big intervals.
A S/H good quality PCP match rifle is a big step up over a budget new match rifle and the AR 20 is a budget rifle, a good one, but still a budget rifle, the MPR is a multi purpose rifle, and is also not in the same league as a good S/H match rifle.
A 30 year old rifle is just that, very pretty, great for fun, and collectable, and in the hands of an expert capable of reasonable results, BUT performance wise its 30 years away, its not just accuracy, which is little changed in 30 years, but ergonomics, balance, trigger, and lock time have moved on big time.
For your money, look around for a Walther LG 300 in any of the variants, or, not my preference, but a FWB 700 in any of the variants, both are in your price bracket, and both are still competitive at the highest (World) level, they will last you until you can afford and can't resist an LG400.
Have Fun
Robin
Walther KK500 Alutec expert special - Barnard .223 "wilde" in a Walther KK500 Alutec stock, mmm...tasty!! - Keppeler 6 mmBR with Walther grip and wood! I may be a Walther-phile?