Free shipping on orders over $500Free shipping over $500 • Fast processing • Family owned • ★ A+ rated on GunBroker (2,965 ratings)★ A+ on GunBroker Help Order status info@nautilusarms.com

Uppers & Conversion Kits

Uppers & Conversion Kits from Radian Weapons, CMMG, Advantage Arms and more, with in-stock items listed first.

Nordic Components

Nordic Components 16" Complete Upper 22 LR 10rd Magazine, Black - 22RB-UPPER-16-KIT

✕ Out of stock

MSRP: $610.00

Was:

Now: $533.12
Radian Weapons

Radian Weapons Upper/Handguard Set 17" Brown - R0612

✕ Out of stock

MSRP: $999.95

Was:

Now: $822.04
Radian Weapons

Radian Weapons Upper 16" 223 Wylde FDE - R0473

✕ Out of stock

MSRP: $2,029.95

Was:

Now: $1,605.59
LanTac USA LLC

LanTac Recon Upper 223 Wylde 16" - 01-FA-223-RECON-UPR

✕ Out of stock

MSRP: $1,322.99

Was:

Now: $780.82
Radian Weapons

Radian Weapons Upper/Handguard Set 14" Brown - R0626

✕ Out of stock

MSRP: $924.95

Was:

Now: $818.77
Rock River Arms

Rock River Arms Compensated Coyote Car A4 Upper 300BLK 16" - BLK0592

✕ Out of stock

MSRP: $820.00

Was:

Now: $705.35
Heckler & Koch

HK UPPER MR556A4 5.56 16.5" BLK

✕ Out of stock

MSRP: $2,499.00

Was:

Now: $2,164.20
Radian Weapons

Radian Weapons Upper/Handguard Set 17" FDE - R0613

✕ Out of stock

MSRP: $999.95

Was:

Now: $822.04
San Tan Tactical

San Tan Tactical STT-15 Pillar Upper Receiver - STT-PILLAR-1

✕ Out of stock

MSRP: $210.00

Was:

Now: $190.39
Advantage Arms

Advantage Arms Conversion Kit For LE26-27 with Bag - AACG26-27G3

✕ Out of stock

MSRP: $285.00

Was:

Now: $238.03
Radian Weapons

Radian Weapons Upper 17.5" 223 Wylde OD Green - R0481

✕ Out of stock

MSRP: $2,069.95

Was:

Now: $1,382.99
Tactical Solutions

Tactical Solutions TSG-22 Conversion Kit Fits Glock 17/22/34/35/37 4.80" 22 LR - TSGCON17STD

✕ Out of stock

MSRP:

Was:

Now: $176.40
META TACTICAL LLC

Meta Tactical MX-1 Conversion Kit Fits Glock Gray Aluminum Frame - MX1-PS-GY

✕ Out of stock

MSRP:

Was:

Now: $184.74
Primary Weapons

Primary Weapons Uxr- Conversion Kit Black 308 Win 16" Barrel - UXR-CK-308-16

✕ Out of stock

MSRP:

Was:

Now: $421.82
FightLite

FightLite MCR DF Upperr 556 M-LOK 12.5" - MCR-060MS

✕ Out of stock

MSRP: $6,399.99

Was:

Now: $5,304.99
Walther Arms

Walther Hammerli Arms Conversion Kit Black 22 WMR - 580540

✕ Out of stock

MSRP:

Was:

Now: $207.54
CMMG

CMMG Bravo Conversion Kit 22 LR Stainless Steel Fits AR-15 (223/5.56 Only) - 22BA60F

✕ Out of stock

MSRP:

Was:

Now: $143.23
CZ

CZ Shadow 2 Kadet Kit 22 LR 10-Round 4.89" Barrel Black Hard Coat Anodized - 01613

✕ Out of stock

MSRP:

Was:

Now: $399.09
Primary Weapons

Primary Weapons Uxr- Conversion Kit Black 6.5 Creedmoor 18" Barrel - UXR-CK-65CM-18

✕ Out of stock

MSRP:

Was:

Now: $421.82
WMD Guns

WMD Guns Nib-X Upper Recr 5.56 Stripped - 1-NIBXUF

✕ Out of stock

MSRP: $119.00

Was:

Now: $101.10
CMMG

CMMG Echo 25-Round Black Steel - 22BA64E

✕ Out of stock

MSRP:

Was:

Now: $179.01
KIMBER MFG.,INC

Kimber. Inc 1911 Rimfire Compact Conversion Kit 10-Round Black - 1100479

✕ Out of stock

MSRP:

Was:

Now: $287.58
Barrett

Barrett Mradelr Bar Conversion Kit 416 Includes Barrel/Muzzle Brake/Bolt - 19660

✕ Out of stock

MSRP:

Was:

Now: $2,470.20
KIMBER MFG.,INC

Kimber Inc 1911 Rimfire Target Full Size Silver 22 LR 10-Round Match Grade - 1100044

✕ Out of stock

MSRP:

Was:

Now: $365.82