The Armory
Buy This AR15 Olympic Arms K3B M4 Semiauto (5.56/223) Rifle for Sale

AR15 Olympic Arms K3B M4 Semiauto 5.56 or 223

Be the first one to write a review
Qty   1+  
Price $1,199.99
In Stock

Olympic Arms now offers an upgrade option for the K3B to include the military's Special Ops M4-style upgrade package. Having worked closely with the military's developmental upgrade program for the M16M4 carbine, Olympic knows what it takes to make a good one, and this is a good one! Standard features include a 16" button rifled match grade 416 stainless steel barrel with black oxide finish and military M4 contour barrel, collapsible, factory installed flash hider and M4 style oversized fiberite handguards. Also available in A3 Style and Tactical Carbine.

AR15 Olympic Arms K3B-M4 16" Rifle

AR15 Olympic Arms K3B-M4 16" Rifle  


The Olympic Arms 16-inch carbine is the rifle that will offer fun for a very long time.  With Olympic Arms match grade barrel your K3B will start and stay accurate, outperforming other manufacturers barrels on the market.  Often described as a rugged, reliable, accurate, and comfortable is rifle occupies the trunks of hundreds of police patrol cars.  Standard in a 5.56 NATO chambering, this personal package is available in four different pistol calibers, as well as with a flattop upper receiver


K3B-MIL4 specifications:

All the features of the K3B, with the addition of:

Collapsible stock

Mil4 barrel

Mil4 Handguard


A rugged and reliable carbine with a tactical rifle look. Standard with a collapsible stock, flash suppressor, and mil 4 barrel, this rifle still won't break the bank.




Description / Information Code: K3B-M4

7075 T6 Aluminum Forged Receivers Made By Olympic Arms

Black Matte Anodized Receivers

Parkerized Steel Parts

Gas Operated Semi-Automatic

Upper Type

A2 w/ fully adjustable rear sight

Front Sight

Elevation adjustable post w/ bayonet lug


M4S Fiberite w/ heat shield


16", button rifled, M4 416 stainless steel


5.56 NATO


Long-life non-chromed bore

Twist Rate



A2 flash suppressor


6-point collapsible


32.25" / 6.34 lbs.


Consider the A3-TC variation featuring a flat top upper receiver and detachable carry handle.


Following two options package should consider before placing your order both of them will enhance the tactical capability of your rifle K3B-M4.


 Option 1 adds the A3 Flat top and Detachable Carry Handle ($90.00 extra) at check out.


Option 2 turn your K3B in to tactical carbine Mil4-A3-TC ($173.00 extra) which adds the A3 flattop detachable carry handle and flattop lower receiver also F8R Firsh Handguard to ensure you have enough space for all your accessories