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Complete Upper Receivers
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16
Items
Maxim Defense MDX 510 300 Blk Mil-Spec Complete Upper - 10.3" Black
$1,255.50
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Maxim Defense MDX 505 PDX Mil-Spec Complete Upper - 5.5" Black
$1,165.50
View Details
Maxim Defense SDX 508 300BLK Integrally Suppressed Upper - 8.5"
$2,155.50
View Details
Maxim Defense MDX 508 300 BLK Mil-Spec Complete Upper - 8.5"
$1,255.50
View Details
Noveske N4 Shorty 300BLK AR-15 Complete Upper Receiver - 10.5"
$1,401.25
Add to Cart
Maxim Defense MDX 510 300 Blk Mil-Spec Complete Upper - 10.3" Arid
$1,255.50
Out of stock
Maxim Defense MDX 505 PDX 300BLK Mil-Spec Complete Upper - 5.5" Urban Grey
$1,165.50
Out of stock
Primary Weapons Systems 300 BLK MK109 MOD 1-M Complete Upper - 9.75"
$1,029.49
Out of stock
Maxim Defense MDX 505 PDX Mil-Spec Complete Upper - 5.5" Arid
Out of stock
SIG SAUER MCX Rattler 300BLK Complete Upper - 5.5"
$1,999.99
$1,759.99
Out of stock
Noveske GEN 4 Carry Handle Diplomat 300BLK Upper Receiver Group - 7.94"
$1,534.25
Out of stock
Primary Weapons Systems 300 BLK MK1 MOD 2-M Complete Upper - 9.75"
$1,299.95
Out of stock
Rainier Arms / Rellim Arms AR-15 300BLK Take Down Upper Receiver Assembly - 8"
$1,299.99
Out of stock
Aero Precision M4E1 300BLK Complete Upper Receiver w/Atlas R-ONE Handguard - 8" Black
$534.99
Out of stock
Daniel Defense DDM4 300 S Blackout Upper Receiver - 10.3"
$1,307.00
Out of stock
Q LLC Sugar Weasel Upper 300BLK 13"
$1,125.00
Out of stock
16
Items
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Shop By
Now Shopping by
Caliber
300 Blackout
Remove This Item
Gas Block Diameter
.750"
4
item
Threaded
Yes
1
item
Thread Pitch
5/8x24 (.30 cal)
5
item
Product Type
AR-15 Complete Upper Receiver
11
item
Complete Upper
6
item
Model
Sig MCX
1
item
Platform
AR-15
3
item
Sig Sauer
1
item
Color
Finish
Arid
1
item
Cerakote
1
item
Anodize
1
item
Barrel Length
5.5"
4
item
7.94"
1
item
8"
2
item
8.5"
2
item
9.5"
1
item
9.75"
1
item
10.3"
3
item
10.5"
1
item
13"
1
item
Gas System
Pistol
6
item
Mount
M-LOK
2
item
Picatinny
2
item
Price
$0.00
-
$999.99
1
item
$1,000.00
-
$1,999.99
14
item
$2,000.00
and above
1
item
Rail Length
6.91"
1
item
7"
2
item
8.5"
1
item
9.5"
1
item
9.75"
1
item
Option
AR-15
1
item
Manufacturer
Aero Precision
1
item
Daniel Defense
1
item
Maxim Defense
7
item
Noveske
2
item
Primary Weapon Systems
2
item
Q, LLC
1
item
Rainier Arms, LLC
1
item
Sig Sauer
1
item
Twist Rate
1:6
1
item
1:7
3
item
1:8
1
item
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