QC10's QC5 Receiver Set has been made from the ground up to accept
MP5 style magazines. This set will work with most AR15 accessories
that are not a proprietary part of it. The receivers are made from
billet 7075 Aluminium making them very rugged. These receivers are
the hard anodized for corrosion resistance and longevity. If you
want one of the coolest rifles out there, this set is a great
Builder's Kit includes the "bones"- the core components for
building your own Quarter Circle 10 Carbine or Pistol
QC10 Stripped QC5 Lower Receiver with proprietary parts
QC10 Side Charging Upper Receiver
9x19mm barrel in 5.5", 7.5", 10.5", or 16" length
G9 Bolt Assembly
QC10 Adjustable Buffer Kit
Made For the AR Platform- Not Modified
Build a 9mm PCC – Quarter Circle 10 Side Charging QC5 Builder’s Kit
U.S.A. –-(Ammoland.com)- If you're a big fan of AR platform Pistol Caliber Carbines
(PCC's), you've likely heard of
Quarter Circle 10 before. If you're like me and have less experience with these
diminutive lead-spitters, QC10 might be a bit of a new name in your
mental Rolodex. To put it simply, QC10's intent is to position
themselves as the one PCC-well you'll ever need to draw water from.
Quarter Circle 10 specializes only in AR pistol carbines, with
chamberings in 9mm, .40SW and .45 ACP. They have lowers compatible
with Glock, Colt, Sig, and Mp5 mags. There are other options as
well (side charging versus rear charging, skeletonized receivers)
but the bottom line is you won't find any rifle caliber specific
QC10 sent me a “QC-5
builder's kit” with an MP5 mag-compatible lower, side-charging upper, 5.5″ 9mm
barrel, G9 bolt assembly and adjustable-weight buffer. Knowing how
few and far between short AR handguards are, QC10 even offers
M-LOK and Keymod handguards as short as 4.44″, and was kind enough to
include one for the article.
Assembly of the QC10 kit is pretty painless. Starting with the
lower receiver, we see it comes with the mag release and bolt stop
already installed. Quite conveniently, the bolt stop is held in
place by a threaded pin, not a hammered-in roll pin. If you want to
swap in an oversized paddle, the time and effort needed is dropped
That leaves the trigger assembly, takedown pins, grip and receiver
extension. I used a Geissele Super 3 Gun (S3G) trigger, SB Tactical
PDW brace, Mission First Tactical Engage pistol grip and a few assorted extras to finish the parts list.
Side note: the Geissele S3G wasn't on the “approved trigger” list
by QC10, which means it was a known risk going in. It ended up
having reset issues and was swapped for an ALG Defense ACT trigger.
Installing the front takedown pin can be a little frustrating for
those who aren't dexterous. I like to use a flathead screwdriver to
hold the detent pin in place until the takedown pin can slide over
it. This reduces my pin-launching events by about 99%.
The trigger assembly and grip are pretty “drop-in”, especially with
the use of Geissele's trigger and hammer pin placeholders. These
shortened pins hold their respective assemblies together and align
until you slide the permanent pins in through the receiver holes.
The grip is held by a single screw, while also holding in place the
safety selector, detent pin and spring. Finished, the lower looks
great! We still have the buffer spring and weight to cover in an
The upper receiver of the QC-5 is even easier to put together.
While I used a receiver block, the QC-5's unique interior geometry
meant that I couldn't use the block's pins to hold the receiver in
place. Just a small precaution: hold onto it when torquing! There
is no gas block, gas tube or ejection port door to be concerned
with on the QC-5. Simply place the barrel into the upper, apply a
little dab of Loctite to the barrel nut threads and torque it down.
I usually go to around 40 foot-pounds.
The handguard supplied by QC10 has an anti-rotation horseshoe, that
indexes on the (non-present) gas tube. I still installed it to
prevent an unsightly gap. I slid the handguard onto the barrel nut,
aligned the top rails and used the pair of clamps (with Loctite) to
affix the handguard to the nut.
When it came time to choose a muzzle device, I had to go with my
favorite. Flash suppressor? Muzzle brake? Nope, a suppressor. Call
it a silencer, can, sonic reducer or whatever you please: just
don't catch me at the range without one. Since I picked up my first
in 2005, I keep my guns quiet whenever possible.
Installing a fixed-barrel spacer into my AAC Ti-Rant 45 (with 9mm
adapter piston) took only seconds, and means I won't risk damage to
the suppressor, which is OEM set up for a tilting barrel handgun
(Glock, 1911 etc.). Slide the modified bolt assembly into the
receiver (no charging handle here with a side-charger), and make
sure to depress the little proprietary catch at the back of the
upper when assembling with the lower.
Finally, let's cover the adjustable-weight recoil buffer. It comes
with 4 tungsten weights (and pads) installed, as well as 4 steel
and 4 aluminum weights as extras. An allen-head screw/pin holds the
blue rubber shock pad in place, which in turn holds the weights and
pads inside the buffer. QC10's handy included chart indicated that
a suppressed 9mm should have 8-11 oz of weight in the buffer. To
get there, they recommend using all 4 of the steel weights, which
brought it just barely to 8 oz. I changed out one steel for a
heavier tungsten weight, as I'm going to be testing this PCC with
some hot ammo. This brought the buffer up to ~9 oz. Standard
carbine spring to go with the buffer and into the receiver
extension, and the gun is done.
The QC-5 comes in a 5 lbs 9.1 oz, not counting the suppressor or
optic. A good chunk of that (18.1 oz) is tied up in the SB PDW
brace, but the gun balances very well. Someone wanting a lighter
overall package could certainly pick a different brace.
I topped off the PCC with a Vortex AMG UH-1 (as well as the AAC
Ti-Rant), and will also bring a Nikon low power variable optic out
to the range to see how this think performs! I have a good bundle
of ammo on-hand, so stay tuned for a range day update. So far, this
is looking like an interesting (and more modern) MP-5 alternative.
Price on this builders kit (both receivers, barrel, bolt assembly,
buffer assembly) is $949.95.
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