Blue Line Pump Magazine Extension +1

Blue Line Pump Magazine Extension +1

SJ HARDWARE
SKU:
BLUE-LINE+1
|
UPC:
0990491000018
$99.99
(2 reviews)
Width:
1.97 (cm)
Height:
1.18 (cm)
Depth:
4.72 (cm)
Current Stock:
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Upgrade your Blue Line Pump shotgun with our extended magazine tube.

This essential add-on increases your round count, keeping you ready for action whether you’re at the range or in a tactical scenario. Built for durability and a flawless fit, it ensures reliable performance and smooth feeding with every shot.


+1 - 3.5 inches long

Comes with our:

    • CNC Machined Green No-Jam Delrin Mag Follower
    • Million Cycle Count Spring & 3 Position Front Sling Mount.


CNC Milled from a solid block of 4140 steel.
Finish: Cerakote Graphite Black.
100% Made in Canada.

  • 4
    Is a +1 as advertised...but Blue Line is 5+1...PLEASE MAKE A +2

    Posted by Andrew P on Mar 24th 2026

    So online I see different reviews and statements on the Blue Line Pump (BL-18). Some people say it is a 5+1 some people say it is a 6+1. Well no matter the type of fold on the shell it is a 5+1. Removing or flattening the dimples inside makes no difference prior to the +1 tube being placed. When you put this on it makes it a 6+1 (and flatten/drill the dimples in the ammo tube). This 6+1 fits flush with the Barrel. No matter how you slice and dice, this is a +1 tube extension. I keep the spring proper to the length they state and with either the follower provided or that came with the shotgun and I still have a +1. However, I will say, it is a micro measurement away from being a +2 extension. What I mean by this is if they add, I want to say about 1 inch, maybe not even, and then this will be a +2. ---- SJ Hardware PLEASE make a +2 version. I do not care about a perfect flush fit, I want my 7+1 shotgun. Other +2 extensions are waaay too long, and add an entire 3 inches past the barrel. Without exaggeration, I'll buy three of these in a +2 version for the BL-18s I have.

  • 5
    Its +2 I am Dumb

    Posted by Andrew P on Apr 1st 2026

    This is a +2. When the dimples are removed from the Blue line it becomes a +1 and thus capacity is brought to 6 in the tube (using factory spring). Once this is added (using factory spring) this become a 7 round tube. SJ Hardware delete my prior review please. 5 stars.

Reviews

  • 4
    Is a +1 as advertised...but Blue Line is 5+1...PLEASE MAKE A +2

    Posted by Andrew P on Mar 24th 2026

    So online I see different reviews and statements on the Blue Line Pump (BL-18). Some people say it is a 5+1 some people say it is a 6+1. Well no matter the type of fold on the shell it is a 5+1. Removing or flattening the dimples inside makes no difference prior to the +1 tube being placed. When you put this on it makes it a 6+1 (and flatten/drill the dimples in the ammo tube). This 6+1 fits flush with the Barrel. No matter how you slice and dice, this is a +1 tube extension. I keep the spring proper to the length they state and with either the follower provided or that came with the shotgun and I still have a +1. However, I will say, it is a micro measurement away from being a +2 extension. What I mean by this is if they add, I want to say about 1 inch, maybe not even, and then this will be a +2. ---- SJ Hardware PLEASE make a +2 version. I do not care about a perfect flush fit, I want my 7+1 shotgun. Other +2 extensions are waaay too long, and add an entire 3 inches past the barrel. Without exaggeration, I'll buy three of these in a +2 version for the BL-18s I have.

  • 5
    Its +2 I am Dumb

    Posted by Andrew P on Apr 1st 2026

    This is a +2. When the dimples are removed from the Blue line it becomes a +1 and thus capacity is brought to 6 in the tube (using factory spring). Once this is added (using factory spring) this become a 7 round tube. SJ Hardware delete my prior review please. 5 stars.