American Rifleman - December 2020 - 65

G

ROCK RIVER R9 COMPETITION BT-9G

MANUFACTURER: ROCK RIVER ARMS (DEPT. AR), 1042 CLEVELAND ROAD, COLONA, IL 61241; (866) 980-7625; ROCKRIVERARMS.COM
32.5" TO 36"
0.5"
0.5"

SAFE

11" TO 14.5"

ACTION TYPE: BLOWBACK-OPERATED,
SEMI-AUTOMATIC, CENTER-FIRE RIFLE
CHAMBERING: 9 MM LUGER

n

RECEIVER: ALUMINUM
BARREL: CHROME-MOLY STEEL; 10-GROOVE,
1:10" RH TWIST
MAGAZINE: 17-ROUND DETACHABLE BOX

SIGHTS: NONE; PICATINNY RAIL
TRIGGER: TWO-STAGE; 4-LB. PULL
WEIGHT: 6 LBS., 14 OZS.
ACCESSORIES: OWNER'S MANUAL,
HARD CASE, LOCK
MSRP: $1,275

SHOOTING RESULTS (50 YDS.)

t

s,
d

16.25"

FIRE

The R9 Competition makes
use of a non-rotating,
blowback-operated bolt
(above & r.), which differs
from that of the directimpingement AR-15 (top).

uses a one-piece bolt that resembles
a standard AR carrier with a bolt face
machined into the front and an extra
weight pinned into the back. In total,
it weighs 3.2 ozs. more than a standard
5.56 mm bolt carrier group. Inside the
receiver extension a 5.5-oz., two-piece,
9 mm Luger-specific buffer helps tame
the recoil impulse of the straight blowback design.
The R9 BT-9G's lower receiver differs in several ways from a standard
5.56 mm AR lower. Three adaptations
are made in order to facilitate the use
of pistol magazines. First, the magazine well is machined to accommodate
the size and feed angle of the pistol
magazine. Second, because the magazine catch cut-out on pistol magazines
is in the front (versus the side on a
standard AR magazine), the magazine
release button is in its typical position,
but the actual catch must cantilever to
the front of the receiver to reach the
pistol magazine's catch cut.
Third, Glock magazines are set up
for the front edge of the follower to
engage the slide lock, versus the rear
edge of the follower that engages the
bolt catch in 5.56 mm AR magazines.
Rock River overcomes this problem
with a patent-pending solution-a

9 MM LUGER
CARTRIDGE

VEL. @ 10'
(F.P.S.)

ENERGY
(FT.-LBS.)

FEDERAL SR
115-GR. SRN

1311 AVG.
6 SD

439

2.03

2.84

2.51

FIOCCHI TD
115-GR. FMJ

1269 AVG.
31 SD

411

2.10

3.33

2.60

SPEER LAWMAN
124-GR. TMJ

1242 AVG.
13 SD

425

1.36

2.12

1.73

AVERAGE EXTREME SPREAD

2.28

NOTES: MEASURED AVERAGE VELOCITY FOR 10 SHOTS OVER A COMPETITION ELECTRONICS
PROCHRONO CHRONOGRAPH AT 10 FT. ACCURACY RESULTS FOR FIVE CONSECUTIVE, FIVESHOT GROUPS AT 50 YDS. FROM A CALDWELL REST. TEMPERATURE: 48° F. HUMIDITY: 23%.
ABBREVIATIONS: FMJ (FULL METAL JACKET), SD (STANDARD DEVIATION), SR (SYNTECH RANGE),
SRN (SYNTECH ROUND NOSE), TD (TRAINING DYNAMICS), TMJ (TOTAL METAL JACKET).

small bar is tripped by the pistol
magazine follower in the front and
raises up a 5.56 mm-type bolt catch
in the rear. These designs allow for
controls in the standard AR positions,
with a left-side safety lever and bolt
release, and a right-side button magazine release. Pistol versions of the
BT-9G with an arm brace are available
in 4.5"-, 7"- and 10.5"-barrel lengths. 
The R9 Competition's 16" barrel is
chrome-moly steel, with the muzzle
threaded 1/2x36 TPI and capped
with Rock River's breacher-style
"mini-brake." It is almost enclosed
by a lightweight, 15", free-floating
handguard with M-Lok-compatible
slots. There is a 23⁄8" section of
Picatinny rail on the top front of the
handguard for the mounting of an
iron sight, and a 1¾" section at the
rear that mates up with the standard
AR flattop receiver rail. No sights are
supplied from the factory. 
The R9 Competition is outfitted
with Rock River's Operator telescoping
stock that uses a commercial-spec,
six-position receiver extension. The
stock has an enhanced cheek-weld
AMERICANRIFLEMAN.ORG

R2012_DOPEBAG.indd 65

GROUP SIZE (INCHES)
SMALLEST LARGEST AVERAGE

DECEMBER 2020

area, a rubber buttpad, two waterproof battery storage compartments
and Magpul-compatible QD swivel
sockets. The pistol grip is a Hogue
overmolded rubber model. 
We mounted a Vortex Strike Eagle
1-6X 24 mm scope to evaluate the
rifle on the range. Groups stayed just
under 2.5" at 50 yds. with all types
of ammunition we tried. A great aid
in accomplishing this was the factory
trigger. The two-stage trigger broke
crisply at 4 lbs. and had a short reset.
The R9 BT-9G functioned with every
type of Glock magazine we tried,
including the supplied 17-round ETS
magazine, Magpul Glock PMAGs, and
factory Glock magazines ranging in
capacity from 10 to 33 rounds.
The gun ships from the factory in
a hard case. Add iron sights or the
optic of your choice, and it's ready to
ring steel. Melding elements of the
traditional Colt 9 mm Luger AR design
with accommodations for using Glock
handgun magazines, all while retaining the full functionality of the AR
platform, the BT-9G is a PCC ready to
take on the competition.

65
10/8/20 9:58 AM


http://www.ROCKRIVERARMS.COM http://www.AMERICANRIFLEMAN.ORG

American Rifleman - December 2020

Table of Contents for the Digital Edition of American Rifleman - December 2020

Contents
American Rifleman - December 2020 - C1
American Rifleman - December 2020 - C2
American Rifleman - December 2020 - 1
American Rifleman - December 2020 - Contents
American Rifleman - December 2020 - 3
American Rifleman - December 2020 - 4
American Rifleman - December 2020 - 5
American Rifleman - December 2020 - 6
American Rifleman - December 2020 - 7
American Rifleman - December 2020 - 8
American Rifleman - December 2020 - 9
American Rifleman - December 2020 - 10
American Rifleman - December 2020 - 11
American Rifleman - December 2020 - 12
American Rifleman - December 2020 - 13
American Rifleman - December 2020 - 14
American Rifleman - December 2020 - 15
American Rifleman - December 2020 - 16
American Rifleman - December 2020 - 17
American Rifleman - December 2020 - 18
American Rifleman - December 2020 - 19
American Rifleman - December 2020 - 20
American Rifleman - December 2020 - 21
American Rifleman - December 2020 - 22
American Rifleman - December 2020 - 23
American Rifleman - December 2020 - 24
American Rifleman - December 2020 - 25
American Rifleman - December 2020 - 26
American Rifleman - December 2020 - 27
American Rifleman - December 2020 - 28
American Rifleman - December 2020 - 29
American Rifleman - December 2020 - 30
American Rifleman - December 2020 - 31
American Rifleman - December 2020 - 32
American Rifleman - December 2020 - 33
American Rifleman - December 2020 - 34
American Rifleman - December 2020 - 35
American Rifleman - December 2020 - 36
American Rifleman - December 2020 - 37
American Rifleman - December 2020 - 38
American Rifleman - December 2020 - 39
American Rifleman - December 2020 - 40
American Rifleman - December 2020 - 41
American Rifleman - December 2020 - 42
American Rifleman - December 2020 - 43
American Rifleman - December 2020 - 44
American Rifleman - December 2020 - 45
American Rifleman - December 2020 - 46
American Rifleman - December 2020 - 47
American Rifleman - December 2020 - 48
American Rifleman - December 2020 - 49
American Rifleman - December 2020 - 50
American Rifleman - December 2020 - 51
American Rifleman - December 2020 - 52
American Rifleman - December 2020 - 53
American Rifleman - December 2020 - 54
American Rifleman - December 2020 - 55
American Rifleman - December 2020 - 56
American Rifleman - December 2020 - 57
American Rifleman - December 2020 - 58
American Rifleman - December 2020 - 59
American Rifleman - December 2020 - 60
American Rifleman - December 2020 - 61
American Rifleman - December 2020 - 62
American Rifleman - December 2020 - 63
American Rifleman - December 2020 - 64
American Rifleman - December 2020 - 65
American Rifleman - December 2020 - 66
American Rifleman - December 2020 - 67
American Rifleman - December 2020 - 68
American Rifleman - December 2020 - 69
American Rifleman - December 2020 - 70
American Rifleman - December 2020 - State_1
American Rifleman - December 2020 - State_2
American Rifleman - December 2020 - 71
American Rifleman - December 2020 - 72
American Rifleman - December 2020 - 73
American Rifleman - December 2020 - 74
American Rifleman - December 2020 - 75
American Rifleman - December 2020 - 76
American Rifleman - December 2020 - C3
American Rifleman - December 2020 - C4
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