Is it A “B” model? If so, you may have difficulty finding magazines, though Armalite has them sporadically. I have an AR10T 16” SS heavy barrel and like it a lot. The 20” will be nose heavy, but pretty damn accurate. The “T” was the model below their “Super SASS” which Rsquare has I believe. That price was about what the gun went for new without the scope and mount. Maybe even a bit less. Considering the market, you will be getting a high performing rifle for-that money. But a “B” model will be discounted a bit as you are locked in to using the Armalite Gen 2 mags. Which are excellent. The barrel is triple lapped and it has the Armalite National Match trigger.