halo2304
03-17-15, 04:11
A while back, I decided to sell my MKE SP89 clone. I didn't shoot it much despite it being reliable, accurate and a close proxy for an MP5k. Looking around some pic threads (Damn you!) I got the AR-9mm pistol/SBR bug.
Rationalizing it, it seems it would be easier to clean and work on since most parts are standard AR-15 parts and the two halves allow better access than the HK guns. Also, it's a lot simpler because it's a standard blowback design vs the proprietary and overly complex roller-delayed blowback system of the HK guns. This isn't meant to bad mouth the MP5 and it's siblings. They've certainly earned a reputation for being one of the greatest guns ever made.
Now then...
Phase 1: Parts Selection
Upper Half
Colt A4 9mm upper
CMMG 9mm BCG
QC10 Barrel 9mm 5.5" 1/2"-28
BCM Gunfighter Charging Handle Mod. 4
Standard Barrel nut
A1 Flash Hider bored for 9mm
Lower Half
GPI Slim Colt-style Lower
White Oak LPK
ALG ACT trigger
KNS Anti-Rotation Pins
Hahn Precision 9mm Buffer
Carbine spring
MI Pistol RE
Magpul K grip
Magpul Enhanced trigger guard
Magpul ASAP-QD end plate
Pre-assembly parts layout.
http://i42.photobucket.com/albums/e309/halo2304/Guns/20150306_145324_7_zpsoigqxj0f.jpg
Fully assembled lower and hand-fitted upper.
http://i42.photobucket.com/albums/e309/halo2304/Guns/20150309_184213_zpstjzeyhi7.jpg
Some parts shown were not used or were swapped out for alternate parts. I bought a set of "dog bone" KNS pins, but decided the full-sized link would be better. The DPMS pistol tube hand guard was only used as a place holder. I chose the...
-GPI lower because it was a less expensive than the QC-10 lowers and I prefer the looks of the Colt-style straight magazine over the angled Glock magazine. Also, I didn't want to hassle with modifying the BCG despite owning a number of Glock magazines already.
-QC-10 barrel because I wanted a 5.5" barrel with 1/2"-28 threads. Nearly every barrel I found was 5" with 1/2"-28 or 5.5" with 1/2"-36. I wanted the 1/2"-28 because when and if I ever get a threaded barrel for my Glock 19, I can use the same silencer.
-Colt A4 9mm upper because I wanted a slick-side upper with just the door. I figured I'd save a little bit of weight by shedding unnecessary parts as well as give it the ability to have a more streamlined look by removing the brass/gas deflector.
-Hahn Precision 9mm buffer because it's slightly longer so no spacer is needed and it's north of the suggested 5.5oz starting point for 9mm buffers.
Rationalizing it, it seems it would be easier to clean and work on since most parts are standard AR-15 parts and the two halves allow better access than the HK guns. Also, it's a lot simpler because it's a standard blowback design vs the proprietary and overly complex roller-delayed blowback system of the HK guns. This isn't meant to bad mouth the MP5 and it's siblings. They've certainly earned a reputation for being one of the greatest guns ever made.
Now then...
Phase 1: Parts Selection
Upper Half
Colt A4 9mm upper
CMMG 9mm BCG
QC10 Barrel 9mm 5.5" 1/2"-28
BCM Gunfighter Charging Handle Mod. 4
Standard Barrel nut
A1 Flash Hider bored for 9mm
Lower Half
GPI Slim Colt-style Lower
White Oak LPK
ALG ACT trigger
KNS Anti-Rotation Pins
Hahn Precision 9mm Buffer
Carbine spring
MI Pistol RE
Magpul K grip
Magpul Enhanced trigger guard
Magpul ASAP-QD end plate
Pre-assembly parts layout.
http://i42.photobucket.com/albums/e309/halo2304/Guns/20150306_145324_7_zpsoigqxj0f.jpg
Fully assembled lower and hand-fitted upper.
http://i42.photobucket.com/albums/e309/halo2304/Guns/20150309_184213_zpstjzeyhi7.jpg
Some parts shown were not used or were swapped out for alternate parts. I bought a set of "dog bone" KNS pins, but decided the full-sized link would be better. The DPMS pistol tube hand guard was only used as a place holder. I chose the...
-GPI lower because it was a less expensive than the QC-10 lowers and I prefer the looks of the Colt-style straight magazine over the angled Glock magazine. Also, I didn't want to hassle with modifying the BCG despite owning a number of Glock magazines already.
-QC-10 barrel because I wanted a 5.5" barrel with 1/2"-28 threads. Nearly every barrel I found was 5" with 1/2"-28 or 5.5" with 1/2"-36. I wanted the 1/2"-28 because when and if I ever get a threaded barrel for my Glock 19, I can use the same silencer.
-Colt A4 9mm upper because I wanted a slick-side upper with just the door. I figured I'd save a little bit of weight by shedding unnecessary parts as well as give it the ability to have a more streamlined look by removing the brass/gas deflector.
-Hahn Precision 9mm buffer because it's slightly longer so no spacer is needed and it's north of the suggested 5.5oz starting point for 9mm buffers.