design cue: "Skeleton" Pistol Caliber Carbine

We count 23 notable semi-auto pistol caliber carbines already on the market: the Kel-Tec Sub-2000, the Angstadt Arms UDP-9 SBR, the Beretta Cx4 Storm, the JP Enterprises GMR-13, the Just Right Carbines, the Thureon Defense GA Carbine, the TNW Firearms Aero Survival Rifle, the IWI Tavor X95 Bullpup 9mm, the Colt AR 6951 9mm, the Kriss Vector, the CZ Scorpion EVO, the Sig MPX 9mm Carbine, the Olympic Arms 9mm, the Hi-Point Carbines, the MPA Defender Carbine, the CMMG MK9 PDW, the AKX-9PT, the Taurus CTG29, the MGI Hydra, the Stag Arms 9T, the Citadel M-1 9mm, Vector Arms UZI rifle and the CIA Centurion UC-9 (and hopefully one day we’ll see the L.W.R.C. SMG-45).

However, only 3 or these utilize a critical element we’d ideally like to see in the ultimate PCC - the Sub-2000, the Hi-Point and the MPA Defender. All three of these carbines use the grip to house their magazines which minimizes mass and protects the vital ammo-feed source from bumps & knocks which can temporarily disable the firearm. The Kel-Tec and Hi-Point are relatively streamlined, and the Kel-Tec is the last man standing in terms of packability. So, over Friday beers yesterday, we came up with a drawing of what we’d like to see in an ideal pistol caliber carbine, here's a list of the features: 1) Glock style grip taking Glock style mags in all Glock calibers. 2) Minimal possible dimensions without forfeiting safety, providing a slender streamlined profile shipping standard with ultra lightweight stock by Ace Ltd. 3) Rapid threaded or bayonet takedown allowing for interchangeable barrels and SBR’ing. 4) Threaded barrel as standard. 5) Full rails top and bottom. 6) A pistol version with standard buffer tube and 6” barrel. 7) Weight under 3.5lbs. With full sized 9mm pistols coming in at an average of 1.5lbs, there is no reason why a very svelt 9mm carbine couldn’t come in at just 2lbs heavier - anyone selling a 7lb PCC is selling excessive flab, in our opinion.

Now here’s the deal - feel free to use this (or any) idea we knock out, exactly as described and without fear of copyright infringement - in exchange for 1)free finished-product samples, 2)running ads on the AFD and 3) throwing us a bone when you hit your first million. Thereby that’ll keep us brainstorming, up and running, lights on, coffee in the pot and beers on Friday! ED 

​Description 
At last, a trim Pistol Caliber Carbine that's compatible with your Glock sidearm and takes any AR buttstock. Top and bottom rails allow for customizing with your preferred accessories and a no-frills straight blowback design makes functionality a cert. No manual safety to fuss with, a threaded barrel allows addition of a suppressor and once you've picked your caliber this little beauty will take any relevant Glock mag, any generation, any capacity. This baby is designed by be slim, reliable, accurate, robust and packable whatever your pastime or mission!
Estimated specs
Length: 31.00"
Barrel: 16.25" interchangeable
Height: 5.50"
Weight: 3lbs 2oz
Width: 1.20"
Color: Black polymer & brushed stainless/aluminum, or black polymer & parkerized
Caliber: 9mm, 40S&W, 45ACP, 10MM.
Trigger: DAO
Safety: internal
Sights: none/1913 picatinny rails
MSRP: $499