Build Better With Brownells & Save 15% On $250+ Parts Order w/ Code: BUILDBETTER

Build Better With Brownells & Save 15% On $250+ Parts Order w/ Code: BUILDBETTER

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BrownellExclusive
CouponOFF

KAK INDUSTRY LLC. K-SPEC 5.56X45MM NATO COMPLETE UPPER RECEIVER

Barrel Length
Brownells #
MFR #
UPC
$599.99
Coupon Code BUILDBETTER

In stock

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Made In The U.S.A.

Products marked with the Stars and Stripes are proudly made in the U.S.A.

Many customers have asked us to show which products are made in America, and we’ve begun working with our vendors to identify them. This information, however, is not available for all items nor does it imply that foreign merchandise is of lesser quality. We will continue to gather this information to assist our customers in making informed buying decisions, and will keep our website current with the latest information.

Guaranteed. Forever.®

We make purchasing and returning products as simple as possible. If you buy a product from Brownells and decide you don’t need it, don’t want it, or just don’t like it, we’ll take it back any time… with a few exceptions

Exceptions include: 

  • Firearms
  • Ammunition
  • Modified 80% frames & receivers 
  • Gun powder
  • Primers
  • Liquids
  • Limited Quantity/Hazardous items
  • Products that are subject to pending or implemented restrictions due to Federal, State, or Local regulation/legislation

All other products are Guaranteed. Forever.® you can easily identify these products by the Guaranteed. Forever.® Icon.

Guaranteed. Forever.

Guaranteed. Forever.® return policy applies to the product’s original owner along with proof of purchase. Any items returned within 45 days of shipment are entitled to a refund. Any items returned after 45 days of shipment will be issued store credit in the form of a Brownells Gift Card. If a Brownells/Sinclair product was purchased through another retailer as a new product we will require proof of purchase to replace or refund.  (Refund will be issued as store credit in the form of a Brownells gift card.)  

Brownells and KAK Industry have partnered to build the best performing complete upper at an unbeatable price. This premium complete upper features a chrome-lined barrel, chrome-lined phosphate K-SPEC Enhanced BCG, Brownells-exclusive PentaComp muzzle device, and a rock-steady free-float KAK Industry MLOK handguard. 100% American made for years of dependable service.

The K-SPEC Down Vent BCG represents unrivaled reliability, featuring Slotted Angled Carrier Rails, Dual Ejectors, and downward gas vents that redirect gas underneath the carrier instead of out at the shooter’s face. For suppressed shooting with a traditional baffle can, the K-SPEC down vent BCG is a game-changer.

This complete upper features:


  • Forged 7075 T6 Upper Receiver
  • Mid-Length gas system
  • 1/2x28 muzzle threads with Brownells-exclusive PentaComp device
  • Chrome-lined phosphate K-SPEC Enhanced BCG
  • Large Billet Latch enhanced charging handle

SKU: 430110224
16” 4150 CrMoV chrome-lined barrel with 1:7” twist rate, twice stressed relieved
15” MLOK handguard with heavy-duty barrel nut

SKU: 430110225
13.9” 4150 CrMoV chrome-lined barrel with 1:7” twist rate, twice stressed relieved
13” MLOK handguard with heavy-duty barrel nut

SKU: 430110226
14.5” 4150 CrMoV chrome-lined barrel with 1:7” twist rate, twice stressed relieved
13” MLOK handguard with heavy-duty barrel nut


  • Each upper is test fired to ensure reliable function.
Specifications

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Restriction

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