My two WASR-10s and Arsenal SLR-107 are now indistinguishable after 150 rounds. I will admit that the SLR felt smoother than the WASRs on day 1 and the SLR has a spray paint job, while the WASR is just parkerized.
Each now has an ALG AKT-EL trigger (sans disconnector tail) and a fighter muzzle brake. The triggers are fabulous and exactly the same. I sanded the small ridge off each hammer. After 150 rounds, I can't tell the difference between the WASRs and SLR cycling while firing and also hand cycling the bolt. They are all equally smooth and I didn't touch the rails.
Instead of buying the SLR-107, I should have added $200 and bought 2 more WASRs. Ten minutes prep and five minutes painting with Alumahyde II Flat Black and I now have two WASRs that are equals to my SLR. These are not the WASRs of old! I am both surprised and delighted.
Additionally, the triggers on the WASRs were fine right out of the box and are identical to Tapco G2s. The Arsenal trigger was awful out of the box.
Hungarian, Yugo (Zastava) and Korean tanker 20 round mags fit the WASRs and the SLR. Most Croatian fit both and some needed some sanding, but once sanded, they lock in and don't move a mm in any direction.
My WASRs were $539.each which was the lowest I had found. Centerfiresystems.com. They are very nice people. Even at $650, I'd still consider it a good deal given their recent upgrade in quality. Or you could spend north of $900 and get a mediocre paint job and really lousy trigger. Been there...done that. Recently.
Kudos to the WASRmakers.