American Rifleman - June/July 2021 - 73

Glock-Mag AR With A Twist
ANGSTADT ARMS/MACON ARMORY-10 MM AUTO

In 1982, Colt introduced a 9 mm submachine gun version of the M16. Three years later, it brought out a semiautomatic 16 " -barreled carbine version, and the AR-15
pistol-caliber carbine was born. They were soon joined by
AR-15 innovator Olympic Arms, which expanded the pistolcaliber-AR market beyond 9 mm to include .40 S&W, .45 ACP
and 10 mm Auto. Though Olympic started out using modified
Uzi magazines in its PCCs, by the late 1990s it was making
AR-15 lowers compatible with common pistol magazines,
including the Glock.
While the 10 mm Auto cartridge has traditionally been
somewhat of a rarity in rifles, the recent resurgence in
interest in the cartridge has crossed over into the PCC
world. Pistol-caliber carbines in 10 mm Auto are now
available from companies such as CMMG, KRISS USA, Just
Right, TNW and Hi-Point. A 16 " barrel wrings the maximum performance out of the high-strung 10 mm Auto,

with several of the cartridges I tested producing more
than 700 ft.-lbs. of muzzle energy. A PCC in 10 mm takes
a pistol cartridge into the realm of close-range hunting
for medium-size game.
In AR-15 rifle form, though, the 10 mm is still uncommon. While the aforementioned 10 mm PCCs have plenty of
room in their receivers to house a bolt with enough mass to
handle the pressures developed by the 10 mm cartridge, the
AR-15 presents its own problems when trying to fit a blowback system within the confines of a 5.56 mm-sized receiver.
Even when chambered in 9 mm, an AR-15-type rifle must be
adapted to a blowback action, with extra weight added to
the bolt, a reinforced hammer and heavier buffer.
A solution to this problem is offered by Georgiabased Macon Armory. Known for its AR-45 .45 ACP AR-15
conversions, Macon builds an upper
ANGSTADT ARMS/MACON ARMORY SHOOTING RESULTS (50 YDS.)
chambered in 10 mm Auto that is
a locked-breech design with directENERGY
GROUP SIZE (INCHES)
10 MM AUTO
VEL. @ 10'
impingement (DI) gas operation.
CARTRIDGE
(FT.-LBS.) SMALLEST
LARGEST
AVERAGE
(F.P.S.)
Starting with a standard upper
1268 AVG.
BUFFALO BORE HEAVY
714
1.75
2.37
2.09
receiver, that includes a forward
200-GR. FMJ
18 SD
assist, a case deflector and a dust1322 AVG.
CCI BLAZER BRASS
698
1.09
1.84
1.53
cover, Macon modifies a standard AR
180-GR. FMJ
13 SD
bolt and carrier to accommodate the
1151 AVG.
FEDERAL PREMIUM HST
588
1.58
2.24
1.84
10 mm cartridge. Under the upper's
200-GR. JHP
18 SD
free-float handguard, a low-profile gas
AVERAGE EXTREME SPREAD
1.82
block routes a custom-length gas tube
NOTES: MEASURED AVERAGE VELOCITY FOR 10 SHOTS OVER A COMPETITION ELECTRONICS
back into the receiver. The system
PROCHRONO DIGITAL CHRONOGRAPH AT 10 FT. ACCURACY RESULTS FOR FIVE CONSECUTIVE,
works exactly like a standard rifle-caliber
FIVE-SHOT GROUPS AT 50 YDS. FROM A CALDWELL MATRIX REST. TEMPERATURE: 67° F.
AR-15. When a cartridge is fired, a
HUMIDITY: 72%. ABBREVIATIONS: FMJ (FULL METAL JACKET), JHP (JACKETED HOLLOW
small amount of gas is bled off the
POINT), SD (STANDARD DEVIATION).

ANGSTADT ARMS/MACON ARMORY 10

MM

DI

MANUFACTURER: ANGSTADT ARMS (DEPT. AR), 701 ATANDO AVE., SUITE E, CHARLOTTE, NC 28206; (704) 200-9352; ANGSTADTARMS.COM
MACON ARMORY (DEPT. AR), 2970 MCMANUS ROAD, MACON, GA 31220; (478) 474-2990; MACONARMORY.COM
33.25 " TO 36.50 "
0.50 "

0.50 "
16 "
11.25 " TO 14.50 "

MODEL: ANGSTADT ARMS 1045 (LOWER),
MACON ARMORY 10 MM DI (UPPER)
ACTION TYPE: GAS-OPERATED,
SEMI-AUTOMATIC, CENTER-FIRE RIFLE
CHAMBERING: 10 MM AUTO
RECEIVER: 7075-T6 ALUMINUM ALLOY;
HARD-ANODIZED

73

STOCK: POLYMER
BARREL: 4140 CHROME-MOLY STEEL; MUZZLE
THREADED 5/8X24 TPI; SIX-GROOVE,
1:16 " RH TWIST
AMERICANRIFLEMAN.ORG

JUNE/JULY 2021

MAGAZINE: 15-ROUND DETACHABLE BOX,
GLOCK-COMPATIBLE
TRIGGER: SINGLE-STAGE; 6-LB., 8-OZ. PULL
SIGHTS: NONE; PICATINNY RAIL
WEIGHT: 6 LBS., 10 OZS.
ACCESSORIES: N/A
MSRP: $925 (UPPER), $279 (LOWER),
$140 (LOWER PARTS), $115 (STOCK),
TOTAL: $1,459

73


http://www.ANGSTADTARMS.COM http://www.MACONARMORY.COM http://www.AMERICANRIFLEMAN.ORG

American Rifleman - June/July 2021

Table of Contents for the Digital Edition of American Rifleman - June/July 2021

Contents
American Rifleman - June/July 2021 - Cover1
American Rifleman - June/July 2021 - Cover2
American Rifleman - June/July 2021 - 1
American Rifleman - June/July 2021 - Contents
American Rifleman - June/July 2021 - 3
American Rifleman - June/July 2021 - 4
American Rifleman - June/July 2021 - 5
American Rifleman - June/July 2021 - 6
American Rifleman - June/July 2021 - 7
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American Rifleman - June/July 2021 - 9
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American Rifleman - June/July 2021 - 16
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American Rifleman - June/July 2021 - 19
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American Rifleman - June/July 2021 - Cover3
American Rifleman - June/July 2021 - Cover4
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