870 Mag tube extension for 20.5" barrel - How big can I go, and where can I find one?

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brokendownyota

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870 Mag tube extension for 20.5" barrel - How big can I go, and where can I find one?

Hey guys. Picked up an all-purpose 870 express and now looking to customize slightly.

What's the longest I can go for a tube extension with a 20.5" barrel? Will I need a clamp? Where can I get it?

I"m totally new to this whole "pimp my gun" thing, but I'm enjoying it so far.

Thanks,

-Scott
 
I have a +2 on my 870 with an 18.5" barrel and it sits nearly perfectly flush. A +3 would stick out a bit past the muzzle on your 20.5" barrel but would function fine with no problems.


Mark
 
A +3 extension should be more or less flush with that barrel length.

It would be advisable to go with a clamp for anything longer than a +1 on an 870.

As far as brands go, anything not made by the likes of Tacstar or ATI should be good to go.
 
Mossberg 590s do indeed give you an extra round over most other 20" pump designs, though at a high cost to mag spring life.
 
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