Home Reviews M870 Maruzen M870 ‘Custom’

Maruzen M870 ‘Custom’

by Arnie

M870 custom parts

Model Remington
m870 ABS stock
HFC22 / 1BB
Length: 925mm
Weight: 2,200g


4 + 1 shells

3-10 bb’s
per shell

Review #1
| M870 review #2 | M870
review #3
| M870 custom parts review

I think the first thing one notices when looking
at the M870 Grip Version is the folding stock. The folding stock I used
was the Advanced Research Universal topfolding stock, which is meant
to be used on a variety of real shotguns. Now, I think the Grip version
has a mount on the grip to fit the Maruzen folding stock, and fortunately,
this mount worked almost perfectly for the advanced research folding

only difference was in the design of the locking mechanism. On the advanced
research there is a small latch that catches on the locking mechanism
in the up position. On the maruzen, this latch caught a part of the
grip, and was not able to fold out into the open position. So, I removed
this latch with a Hack saw, and sanded it smooth.

I believe
that the Advanced Research stock is a tiny bit narrower than the Maruzen stock
intended to be used with the M870, but this worked out to my advantage, as
the tight fit acted as a sorf of friction fit locking mechanism in either
the up or open position. It takes a great deal of force to open and close
the stock. And if the fit becomes loose, it’s very easy to tighten the screw
holding it all together.

On top of this stock I placed the 5-shell holder, also
made my Advanced Research. This particular shell holder was designed to be
used with the folding stock, and therefor installation was a snap. It just
screws right into the mounting holes already on the stock. And I think it
adds a touch of class.

The second major part of this phase of the project was
the heat shield. I don’t believe that the Maruzen and the real remington M870
have the same dimensions, due to the fact that the heat shield fits a little
too snuggly on the barrel.

One problem I had was
that the fore grip rubs against the bottom of the heat shield. This friction
caused the racking action to be a little more difficult, and would sometimes
jam up the action all together. The racking action would also cause the heat
shied to twist, and uncenter itself on the barrel.

correct this problem, I took a steel grate, and sanded down the bottom of
the heat shield. This takes a lot of patience, for the Advanced Research heat
shield isn’t made out of airsoft grade metal. It’s meant for the real thing.
But after a while, the heat shield fits snug against the fore grip, but still
making it comfortable to rack.

A word of warning about
the heat shield… when fitting the heat shield to the gun, it will scratch
the finish off of the barrel. This isn’t a problem for me, since I intend
on leaving the heat shield on all the time. But for those who like a modular
customized shotgun approach, be advised that your gun will look like crap
up close if you take the heat shield off.

Here are some links where
I got my info and purchased the parts: http://www.atigunstocks.com/
and http://www.cheaperthandirt.com/

And that’s phase one of my “Ultimate, Badass Shotgun”
project. I would tell you all of my future plans for the shotgun, but I don’t
want anyone stealing my ideas before I’ve implemented them, if you know what
I mean. But I will definitly keep you posted on the outcome. (which will contain:
lasers, flashlights, extended mags, scopes, sights, etc…). Until then, thanks
for checking out my pride and joy shottie. by




:M870 review -the only English review I could find (Arnie)
M870 Riot version review
– a review in Japanese

Guns in Russia”
M870 review – a review in Russian

Other Interesting

M870 Manual
– The official manual for the real-steel Remington
Pump action
Tac Mount
– A Page with details of kits to mount Surefire lights
and lasers onto the shotgun
Extension Kit
@ ATI Gun Stocks – details of magasine extension
tubes for the M870/M1100
– the official US Government’s operators guide to the M870
Remington 870 laser mounting
– a custom method for
fitting a laser unit to the end of the 870, not a method I would recommend
Tactical Shotgun

– an article about shotguns and their use in a tactical environment. It’s
a VERY good read

The original website is from this page here: http://www.angelfire.com/tx/ShotGun/
“The MultiPurpose Shotgun”

on this review in the forums

Last modified:
Wednesday, May 9, 2001 9:37 AM copyright 2001 ArniesAirsoft

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