It has three 1/2" bolts holding it together. It's pretty solid with no rocking or movement in any direction, even when putting my whole weight onto it.
I have carried Remington 870s at work and dislike a few different features on them, so my personal pump action shotgun has always been a Mossberg 590A1. I always said the only 870 I would want is an old chrome bolt wingmaster, preferably with an 18 inch barrel in the police/military style, well yesterday I found just that. 1966 870 Wingmaster that is a former CHP gun, 18 inch barrel, internally it is beautiful, looks like it was barely shot, the bore is a mirror and the bolt is the same, most police shotguns I have come in contact with have about and entire slugs worth of leading in the bore, this one had some dust, two passes of the bore snake and it looked new. CHP is stamped over to turn the C into an O and a P into a B, I didn't know this when I got it, I figured OHB was just some small town police department somewhere or someone's personal initials. Having worked in Law Enforcement it's a little eerie to me to think this gun was likely in a patrol vehicle or on the rack at the station at the same time as the Newhall tragedy, the lessons from which where drilled into me during training, the main one being train how you fight. I plan to keep this mostly original, probably keep an eye out for a vintage plus two extension for defense duty or occasionally swap out for a 28 inch field barrel and take it bird hunting. Other than that its gonna stay loaded with 00 buck or slugs right next to my 590 as one of my go to home defense or woods walking guns. Oh and I paid a fair bit less than two C notes for it so that makes it even better. Somebody just saw a nasty looking old pump action and threw a price tag on ot with out looking closer, it was covered in dried up old oil and grease, it really looked terrible initially.
Updated my BCM 14.5" middy-upper with a new, lo-pro gas block, M-Lok rail from Aim Sports and a Vortex Sptifire AR. Nothing fancy or expensive, I just wanted more reach from the rail as well as pushing the light farther forward. No fixed sights as the Vortex has an etched reticle and is on loan for evaluation.