I've attached an Eagle 6-round mag pouch to the starboard side and it works well, not interfering with my cheek weld when I switch to that side.

The comb is a bit thinner than the Speedfeed, which I like, and the butt pad is more substantial too. The length of trigger pull is shorter than the Speedfeed, great for my somewhat stubby fingers, but the length of pull is standard and fine for my long arms (I've given up on Bantams, which are usually perfect LOTP, but too short an LOP for me, no matter the clothes). I really like the stock on this 51663, actually quite different than the Mossberg Speedfeed featured on the 50668/51668s. I believe the finish of the SPX is the same, but for some reason, not as durable? The matching finish on the SPX Choate tube seems weak, maybe because it's aluminum and the barrel isn't. This gun is surprisingly light - so much so that I had to compare barrels with my 50668 just to be sure! (Maybe it's because I don't handle my 50668 empty much.) The finish is outstanding, done in what I understand is Mossberg's 'Matte Blue,' a dark, dull black finish, unlike the grey-like park finish on my 50668 circa 2002. Excellent condition, no scratches, rubs, blems, etc. Arrived (pics to follow at some point)! R&R shipped the day after I placed my order (maybe they expedite subsequent on-line orders, as my initial SPX order took about 4 days until shipped).

Mossberg serial numbers mfg date