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GEN FOUR SI DEFENSE Billet 5.56 / .223 AR-15 Lower Receiver KAC - Knight's Armament URX 4 IBN Rail 5.56mm 14.5" Length
Our Price: $261.50
List Price: $299.75
Our Price: $293.76
GEN FOUR SI DEFENSE Billet 5.56 / .223 AR-15 Lower Receiver KAC - Knight's Armament URX 4 Rail 5.56mm 14.5" Length
GEN FOUR SI DEFENSE Billet 5.56 / .223 AR-15 Lower Receiver URX 4
KAC - Knight's Armament URX 4 IBN Rail 5.56mm 8.5" Length Trijicon SRS 1.75 MOA Red Dot Sight with Quick Detach Lever
List Price: $269.50
Our Price: $264.11
List Price: $1,125.00
Our Price: $956.25
KAC - Knight's Armament URX 4 Rail 5.56mm 8.5" Length Trijicon SRS 1.75 MOA Red Dot Sight with Quick Detach Lever
URX 4 The Trijicon SRS is a highly engineered sealed reflex sight that eliminates the
tube-effect typically associated with other sealed reflex-style sights. The modern
design incorporates a 28mm aperture that allows easier target acquisition. Its
1.75 MOA dot is small enough for precision and bright enough for speed. The
SRS features an innovative solar cell assisted by a single AA battery.
Aimpoint PRO - Patrol Rifle Optic Red Dot Sight KAC - Knight's Armament URX 4 IBN Rail 5.56mm 13.0" Length
List Price: $453.00
Our Price: $408.00
List Price: $287.38
Our Price: $281.63
Aimpoint PRO - Patrol Rifle Optic Red Dot Sight KAC - Knight's Armament URX 4 Rail 5.56mm 13.0" Length
Unique features for Patrol Rifle Optic

• Always ready - always on. Turn it on for up to 3 years using one single battery.
No need to fumble with switches prior to use.
• 2 minute of angle red dot for accurate target engagement at all distances.
• In service date and battery change date reminders makes inventory tracking
and maintenance easy.
• Enhanced speed on target and increased first shot hit probability when compared
to iron sights and magnified scopes.
• Compatible with all generations of night vision devices and may be used with
Aimpoint 3X Magnifier and Concealed Engagement unit.
• Hard anodized aluminum alloy housing. Rugged enough for real world
conditions and waterproof to 150 feet.
URX 4


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Our website shows real time inventory, never wonder if an item is actually available.

Most orders ship within 1 business day (excluding weekends and USPS holidays) and arrive 1-3 business days later so we can get parts in your hands faster than most dealers can even process your order.

As a well established dealer on AR15.com we have plenty of customer feedback.  Click here to check it out.

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Huge Selection of AR15, M16 & M4 Parts and Accessories

Welcome to Operation Parts. Here you will find only the highest quality tactical gear and gun accessories for rifles, carbines, and submachine guns. We carry rifle handguards, rifle scope mounts and rings and much more from trusted manufacturers such as Advanced Armament (AAC), Aimpoint, A.R.M.S., Blue Force Gear, Black Dog Machine, Brownell's, Buffer Technologies, Ciener, Daniel Defense, Eagle Industries, EOTech, Ergo, Falcon Industries, Gear Sector, Geissele, GG&G, Grip Pod, Harris Engineering, H&K, Insight Technologies, Knight's Armament (KAC), Lewis Machine & Tool (LMT), Magpul, PRI-Precision Reflex, Redi-Mag (Boonie Packer), Rock River Arms, Samson, Specter Gear, Streamlight, SureFire, TangoDown, Target Master, Trijicon, Troy Industries, Viking Tactics, Vltor, Yankee Hill Machine (YHM) and many more.

View customer feedback from AR15.com forums HERE

Be sure to contact us for any products that you don't see, we have a huge selection of AR15 parts and M16 / M4 parts including AR15 stocks and many other products available. Our goal is to stock the quality parts that you need to customize your AR-15, M4, M16, or MP5 while offering them at a very competitive price.

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Today's Super Deal!

GG&G Medium Long Sleeve Shirt, Tan

List Price: $17.00
Our Price: $14.45
Sale Price: $7.99
GG&G MEDIUM LONG SLEEVE SHIRT, TAN
COLOR: TAN
SIZE: MEDIUM
SLEEVES: LONG
MATERIAL: 100% COTTON

Closeout, all sales final on this item.


Top Sellers

Daniel Defense AR-15 Lower Receiver Parts Kit
Our Price: $92.00
Magpul AR-15 PMAG 30 Round Magazine, Black
Our Price: $14.20
Stag Arms AR-15 Lower Receiver Parts Kit
Our Price: $69.00
Daniel Defense AR-15 Carbine Omega Rail 7.0 Inch
Our Price: $250.00


New Products

Helium Whisper Ten Speed™ Double M4 Magazine Pouch, Coyote Brown
Our Price: $24.75
Vickers Combat Applications Sling™, Two-Point Quick Adjust Padded Carbine Sling, Molded Acetal Adjuster And Hardware, Black
Our Price: $52.20
Helium Whisper Ten Speed™ Single M4 Magazine Pouch, Coyote Brown
Our Price: $24.26
Vickers Combat Applications Sling™, Two-Point Quick Adjust, Original Style, Molded Acetal Adjuster And Hardware, Black
Our Price: $42.70
SOC-C™ Modular Padded Belt Kit With Inner Belt And Suspenders, Coyote Brown
Our Price: $161.96


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Operation Parts
PO Box 52
Linden, MI 48451 USA
P: (810) 513-5093
F: (866) 796-5182

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