~~ Special Promotion Details ~~

Cost $359.97 +tax +$7.95 ship

This is a clearance of the Midlength Gas System version of this barrel. Moving forward, Maple Ridge Armoury will be using only Rifle Length gas systems in their 18.6" barrels. We bought all of their inventory. When they are gone, they're gone! Shipping will start when we get them, around August 17.

As an added incentive we will issue you a $50 TNA digital gift card that you may use on a future purchase or give/sell/trade to a friend.

~~~ Product Description ~~~

A pretty friggin slick barrel from MRA in Barrie, Ontario. Precision CNC machined from 4140 Chromoly-vanadium steel and completely stress-relieved. The bore is honed and hand-lapped to ensure a concentric, uniform, and accurately-sized bore. Rifling is air-gauged to verify concentricity within 0.0005".

The barrel has an 'SPR' exterior profile with big flutes to achieve an optimal balance between harmonic resistance, heat resistance, and weight savings.

The unique deep-cut fluting creates more surface area to improve air cooling and reduce weight without compromising barrel rigidity.

MRA only uses their chamber reamers for about 200 barrels so that you always get a nice smooth finish (see the cutaway picture)

The 1:8” twist rate effectively stabilizes projectiles from 55 to 77 grains.

Chamber: .223 Wylde
1:8" twist rate
Straight flutes
For 0.75" gas blocks
1/2"-28 muzzle threads
Made from 4140 Chromoly-vanadium steel
Bore is honed and hand-lapped
Nickel-boron barrel extension
QPQ black nItride finish
5R button rifled
11-degree target crown
Made in Canada
Gas system (click for gas tube) Midlength
Weight 975g
You get:

(1) Barrel with barrel extension pre-installed
Compatible with:

AR-15, M16 upper receivers
0.75" gas blocks
Muzzle devices with 1/2"-28 muzzle threads
Standard bolt carrier groups (you need to verify headspace to be safe)
Mil-spec barrel nuts (OEM and free-float grip nuts)
.223 Remington and 5.56x45mm NATO ammo
Installation Difficulty:

Tools required: To get it installed and working you should have the Armourers tool and a vice block.

Installation notes: You will need a gas tube of the correct length. Besides that, Youtube is your friend, and it is highly recommended to check the headspace.

These barrels should be broken in. Doing so will help your barrel perform consistently over its lifespan. How to break in your new barrel:

Clean the bore thoroughly before firing for the first time.
Fire 5 rounds, then clean the bore.
Repeat step #2 three more times.
Check that the gas block is still securely fastened.
Inspect the bolt for signs of wear.
Check that your handguard is still nice and tight
Fire 25 rounds, the clean the bore.
Repeat step #5 three more times.