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M - Z
***MAS DEFENSE***
MAGPUL
MISSION FIRST TACTICAL
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10.5" 5.56 NATO
11.5" 5.56 NATO
13.9" 5.56 NATO
14.5" 5.56 NATO
16" 5.56 NATO
18" 5.56 NATO
.223 WYLDE
16" .223 WYLDE
18" .223 WYLDE
20" .223 WYLDE
300 BLACKOUT
6" 300 AAC BLACKOUT
7.5" 300 AAC BLACKOUT
8.5" 300 AAC BLACKOUT
10.5" 300 AAC BLACKOUT
16" 300 AAC BLACKOUT
AR-15 BUILD KITS
AR-15 UPPER PARTS
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9"-10" SPECTER
11"-13" RIFLE
15"+ EXT RIFLE
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1/2 x 28 TPI
1/2 x 36 TPI
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80% LOWERS
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76% - 80% FRAMES & JIGS
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***SALES***
HOLIDAY SALE
BLEM SALE
MAS DEFENSE
BALLISTIC ADVANTAGE
FAXON FIREARMS
G-FLEX TRIGGERS
MAGPUL
MISSION FIRST TACTICAL
NORSSO GLOCK SLIDES
POLYMER80
ROCK RIVER ARMS
SB TACTICAL
SYLVAN ARMS
UTG / LEAPERS
BRANDS
A - L
5D TACTICAL
80% ARMS
AERO PRECISION
BALLISTIC ADVANTAGE
DEL-TON
FAXON FIREARMS
FRANKLIN ARMORY
G-FLEX TRIGGERS
GEISLER DEFENCE
HOLOSUN
JSD SUPPLY
M - Z
***MAS DEFENSE***
MAGPUL
MISSION FIRST TACTICAL
NORSSO GLOCK SLIDES
NORTH SIDE KNIVES
POLYMER80
ROCK RIVER ARMS
SB TACTICAL
SHOCKWAVE - KAK
SYLVAN ARMS
UTG / LEAPERS
AR-9
9MM BARRELED UPPERS
5.25" 9MM
8.3" 9MM
11" 9MM
16" 9MM
AR-9 BUILD KITS
AR-9 UPPER PARTS
AR-9 LOWER PARTS
AR-15
AR-15 BARRELED UPPERS
5.56 NATO / .223
7.5" - 8" 5.56 NATO
10.5" 5.56 NATO
11.5" 5.56 NATO
13.9" 5.56 NATO
14.5" 5.56 NATO
16" 5.56 NATO
18" 5.56 NATO
.223 WYLDE
16" .223 WYLDE
18" .223 WYLDE
20" .223 WYLDE
300 BLACKOUT
6" 300 AAC BLACKOUT
7.5" 300 AAC BLACKOUT
8.5" 300 AAC BLACKOUT
10.5" 300 AAC BLACKOUT
16" 300 AAC BLACKOUT
AR-15 BUILD KITS
AR-15 UPPER PARTS
AR-15 UPPER RECEIVERS
AR-15 BARRELS
5.56 NATO BARRELS
.223 WYLDE BARRELS
300 BLACKOUT BARRELS
AR-15 BCG's / CHARGING HANDLES
HANDGUARDS
ALL HANDGUARDS
ACCESSORIES
DROP IN
4"-5" PISTOL
7" CARBINE
9"-10" SPECTER
11"-13" RIFLE
15"+ EXT RIFLE
AR-15 GAS BLOCKS / TUBES
AR-15 MUZZLE DEVICES
1/2 x 28 TPI
1/2 x 36 TPI
5/8 x 24 TPI
THREAD CONVERTERS
AR-15 LOWER PARTS
LOWER PARTS AND KITS
GRIPS
STOCKS - PISTOL BRACES
PISTOLS - ARM BRACES
RIFLES - STOCKS
80% LOWERS
POLYMER 80% LOWERS
FORGED 80% LOWERS
AR-10
AR-10 BARRELED UPPERS
AR-10 UPPER PARTS
AR-10 UPPER RECEIVERS
AR-10 BARRELS
AR-10 BCG's / CHARGING HANDLES
AR-10 HANDGUARDS
AR-10 GAS BLOCK / GAS TUBES
AR-10 MUZZLE DEVICES
AR-10 LOWER PARTS
AR-10 LOWER PARTS KITS
AR-10 TRIGGERS
AR-10 STOCKS - KITS
AR-10 GRIPS
AR-10 80% LOWERS
GLOCK
GLOCK SLIDE PARTS
GLOCK BARRELS
G26 BARRELS
G19 BARRELS
G17 BARRELS
G23 BARRELS
G22 BARRELS
GLOCK SLIDES & PARTS
G43 SLIDES & PARTS
G26 SLIDES & PARTS
G19 SLIDES & PARTS
G17 SLIDES & PARTS
GLOCK FRAME PARTS
GLOCK 43 FRAME PARTS
GLOCK 26/27 FRAME PARTS
GLOCK 19/23 FRAME PARTS
GLOCK 17/22 FRAME PARTS
GLOCK 20/21 FRAME PARTS
76% - 80% FRAMES & JIGS
P80 JIGS
G43 SINGLE STACK
G26/27 SUB-COMPACT
G19/23/32 COMPACT
G17/22 FULL SIZE
G20/21 SF XL SIZE
SIG P320
SIG P320 SLIDE PARTS
SIG P320 FRAME PARTS
80% INSERTS & JIGS
SIGHTS
SIGHTS
OPTICS
TOOLS
TOOLS
KNIVES
SWAG
Return to 8.5" 300 BLACKOUT AR-15 BARRELED UPPER - MAS DEFENSE SQUADRON 7" LIGHTWEIGHT QUAD RAIL
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0 of 0 people found the following review helpful:
Solid upper
October 8, 2022
: James
Looks great, shipped quickly. Haven’t put any rounds through it yet.
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0 of 0 people found the following review helpful:
9†300blk upper
July 25, 2022
: Xavier S. from IA, United States
Only have 200 rounds through it but it ran great out in the heat. Ran 60 rounds in a mag dump/ how fast can it go type drill, then the other 140 were at various speeds. Didn’t blow gas everywhere like other uppers I’ve used.
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0 of 0 people found the following review helpful:
I love this 300 blackout upper
August 3, 2021
: Brian Kliem from Spring, TX United States
This is my first build for my ar-15 300 blackout. After looking through many different companies who offer uppers for AR-15s I found this brand to be one of the best. Beautiful design gives me everything that I need in an upper it gives me everything that I need to customize to my liking. I will be ordering again because now want to build a rifle. Thank you so much for an easy process in my build. Plus anything and everything that I would need for my AR-15 or any build I can find on here.
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0 of 0 people found the following review helpful:
Good Not Great
April 30, 2021
: Frank Robinson from Pahrump, NV United States
This is a nice upper but the finish is not great. Hand guard has a factory blemish. I have not used it yet. Hope it shoots great. Time will tell.
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MAS Defense Reply: Robert, I apologize for the issue. We have a very good quality control process where 2 employees review every part before it leaves our facility. We strive for perfection but unfortunately we are human and do make mistakes from time to time. With that said, someone should have caught the blemish on the handguard before it shipped out. We emailed you and will make this right!
Thank you for your business and your feedback!
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0 of 0 people found the following review helpful:
Fast shipping
July 29, 2020
: David Coon from Port Angeles, WA United States
everything looks great. Shipping was extremely fast for the impatient shopper. Can't wait to get to the range
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0 of 0 people found the following review helpful:
July 12, 2020
: John Barker from Mooresville, NC United States
Fast shipping. Excellent product !
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0 of 0 people found the following review helpful:
Great quality. First purchase
July 9, 2020
: Seth Pace from Knoxville, TN United States
Item arrived years faster than PSA equipment ever does. Very pleased with the quality of the piece. Eager to get my pistol built with this hardware.
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0 of 0 people found the following review helpful:
Great
July 1, 2020
: from LITTLESTOWN, PA United States
Everything was great. Fast shipping and really well made parts.
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0 of 0 people found the following review helpful:
June 27, 2020
: Andrew Herman from Rensselaer , NY United States
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0 of 0 people found the following review helpful:
Love it
June 26, 2020
: Chris Melton from Edneyville , NC United States
This was better than expected!
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