I bought an M45 some months ago and really get a kick out of it. Short, accurate, relatively light, and definitely good looking. I like wood and blued steel, though an AR is in the works.
The down side is that there are absolutely no aftermarket addons for this make/model. You can add a scope or red-dot, but you won't be able to use the stock sights after fixing a scope rail to the top of the receiver. You can still get Choate folding stocks, or hunt around for the Ramline folder.
Definitely want to get the 16.5 or 21 lb recoil springs. I strongly recommend you also ask Marlin to send you a hammer strut and hammer strut bridge as these are two very weak points in the system. Mine saw about 200rnds when serious bowing started to occur in the bridge.
Anyone try to modify an M1 Carbine (.30cal) hammer strut to fit the Marlin hammer and frame?
I'd love to see some aftermarket goodies come out for the M9 and M45, but I fear that the AR has completely dominated the carbine market. Personally, I can't say they're wrong because you get more rounds in the AR mag, greater versatility in design, longer range of lethality, and that cool EBR stigma.
Anyhow, if you find one around for under five bills, grab it. Then call Marlin and buy all the parts you could possibly need for future repairs (basically, everything but the hammer). Then call Wolff (
www.gunsprings.com) and get the recoil springs. Then gets some bullets and have a great time. It's a wonderfull little gun.