I'm sure every 'Military & Police' person I know, when required to field strip their pistol under combat conditions, would really appreciate grasping the pistol with the right hand, holding the takedown lever down with the right thumb while racking the slide with the left hand to remove for disassembly. Then hold again in the same manner for reassembly. And if that doesn't quite work under combat conditions then rotate and hold the lever down and pinch the guide rod until flush with the barrel and then hope it stays in place during strip and reassembly. Assuming you can see when the guide rod is flush to the barrel. And oh, if it pops back up on you sometimes, try again.
Would you buy a pistol which manual described a takedown procedure like this? Do you own any other pistols with a takedown lever that operates like that? Is an ambiguous and uncertain field strip procedure really no biggie?
All the M&P pistols discussed in this and other threads, that exhibit this behavior, are malfunctioning. Since the problem is apparently somewhat widespread and random, it is probably a design or QC flaw. The S&W manual procedure on field stripping is clear and explicit, with pictures to match. (Pages 21-22, including all M&P C models. Fig. 20 is notable!) After downward rotation the takedown lever should stay put. If all the gyrations described elsewhere on this forum were 'normal' or 'expected', that's what would be in the manual. I read the pistol's manual before I bought it to set my expectations.
They were not met. So my brand new M&P 45 FS is at S&W right now to fix this exact issue, and I expect that they will. If they don't, it will be the first and last S&W M&P pistol I purchase and it's on to another Sig Sauer or FNP, which always operate as I expect.
Pardon my candor, but the suggestion that any M&P pistol should (sometimes?) operate like this is laughable. If this behaviour was expected, normal, and necessary, that's what the manual would describe. At the least for legal protection, if no other reason. I'm also surprised that so many owners appear content with it. My thought is if all the malfunctioning pistols had been sent back to S&W from the beginning, they would have fixed their manufacturing procedure and/or design, as well as the bad pistols. And if this really is the way they're supposed to (sometimes?) operate, they would have revised their manual for the benefit of prospective buyers.
When my M&P 45 is back, I'll be posting up the results on the original thread I contributed to. Now one of many on this topic.