Technically a "pistol," but whatever.
I've been looking at adding a Zenith MP5 to my stable and continuing to follow my horrifically expensive dream of "own the guns I really, really liked from Rainbow Six as a kid." However, I've run into a bit of a snag, as I'm having trouble deciding between the full size and K-length models. I've already got a Scorpion Evo SBR that should be coming back any day now that fills the 7-8" barrel length PCC niche, so I've started leaning towards the MP5K, but I'm also realizing it may be a much more problematic and less reliable option than I'm willing to put up with. For the record, this is a range toy and occasional road trip backpack gun that I intend to shoot 147 gr ammo with the majority of the time, occasionally suppressed.
Right now my pro/con list looks like this:
MP5A3:
+dead bang reliable with standard locking piece and 147 grain ammo/suppressor
+large enough to easily mount lights to M-LOK handguard if added
+not picky on bullet weights
+matches my Die Hard sweater
-more expensive on average
-size niche already filled by Evo SBR
-not nearly as easy to stash in discreet-ish bags that I have
MP5K PDW:
+extremely small, will theoretically fit in my super hipster Toms laptop bag or my unused work briefcase
+shorter barrel length reduces OAL with a mounted suppressor
+about $100-200 less than full-size MP5 (from what I've seen)
-apparently has a hard time with 147 gr ammo when shot with a "stock," suppressed with subsonic ammo, and especially with both, requiring a change to an 80 deg locking piece for reliability, then a change back to factory 110 deg locking piece for reliability with 115 gr
-very little room for light/laser/whatever accessory expansion in future
-does not match my Die Hard sweater
Basically, from an on-paper practical standpoint, the K length looks to be the better option but incurs the high probability of needing troubleshooting for my usual subgun diets of 147 gr flat point ammo and will likely inconvenience me if I don't have subsonics on hand. On the other hand, the full size has reliability in spades and a certain cool factor, but really doesn't do anything my Evo doesn't already do aside from "be an MP5" (which, granted, is still a selling point).
Am I missing anything here that might make one variant or the other more worthy of my attention? I know I said this is a range toy first and foremost, but if a range toy gives me trouble when I ask it to do what I normally do with range toys, then it ceases to be fun and thus is no longer worth considering as a range toy.