DA Grizzly customization - UPDATED - calling it done!

Yeah, I have the magpul stock on other shotguns, but on this one, I was looking for a trimmer gun to carry a lot when working on my woodlot. The hogue set is physically smaller and lighter. It lays against my back flatter for 2 point sling carry across the back. This one was built for that specific use.
 
Claven2 said:
I local gun shop has scrapped some 870's over the years for various reasons. I got 2 flexi-tab carriers (used) from them. You can get new ones from Brownells for around $20 US each. (the second one is going in a Wingmaster build)

To fit one, you either have to use a remington pin, or ream out the carrier's mounting holes by about 5 thou as the DA pin is 5 thou larger in diameter then a Remington pin. You can do this in 5 seconds with a cordless drill if you have the right size bit.


One of mine was a drop-in fit, the other carrier needed a couple file strokes on the hump that the bolt hits to drop the carrier back down when cycling the action. The hump was slightly too tall to fit into the recess in the bottom of the bolt, just enough to make shells hard to load into the mag. A couple file strokes later, and all was fine. Gun's been cycle tested and even the cheap winchester No.4 shells are cycling perfectly.

Realistically, I've had to fiddle around fitting new carriers to real Remingtons as well. They are a stamped metal part and sometimes are just a hair "off", needing very minor bending, tweaking or a few file strokes to work optimally.
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Sounds pretty straightforward.
For some reason I was thinking there was some other modifications needed to the bolt as well.
 
Claven2 said:
Well I believe I have it fixed :) The gun is going to TacOrd tomorrow (mail) for remchtoke install on the 12.5" barrel and cerakote of the gun and 2 barrels.

Here is the fix to my receiver "ledge". Someone asked earlier and YES - the top of a Grizzly receiver IS thicker at the heel than a real Remington. Not anymore (on mine). This is about an hour if filing, measuring, filing, measuring, and then a polish to 200 grit. Matches the Remington heel profile perfectly now. Yes, I know, I'm anal and it's only a cheap shotgun.

IMG_0375_zpsaqtvjwpf.jpg


Now for more fun and games. I got a new 28" express barrel from Dlask ($140). Well, it turns out the Grizzly barrel alignment stud on the front of the ejector assembly on a Grizzly is slightly higher on the receiver than on a Remington. This means remington barrels are about 4 degrees out of index. For a bead sight, not a big deal, but with a vent rib, it's really noticeable when sighting down the barrel. I want this gun to be dual-purpose: a 12.5" choked bbl for general use and a 28" VR as my backup/loaner waterfowl shotgun. (I normally shoot a Beretta Xtrema2).

Well you CAN fix an indexing issue if you really want to put the effort into it. First, you file the TOP of the locator slot on the barrel (opposite the extractor cut), until the barrel indexes. then you mount the barrel and use feeler gauges to see how much of a gap is BELOW the locator stud in the barrel slot. You get a piece of shim stock slightly thicker than that and using oxy-acetylene, you silver-solder the shim to the bottom of the slot and file to shape. You have to be quick wit the torch, you don't want the steel at the locking recess to change colour - that would be bad. The shim will make the slot too tight. Now you slowly file the shim down until the barrel locates on the stud smoothly.

Voila! this will all disappear once the cerakote is on it, but here you can see the shim (in the white):
IMG_0377_zpsb5q2bl8t.jpg


Finally, the Grizzly's ejection port is about 1.5mm TALLER than the remington port. This makes no functional difference, but Remington barrel extensions will stand proud of the ejection port. the fix is to file the curvature off the part of the remington barrel extension that would overhang into the ejection port like this:

IMG_0378_zps7qve5bsi.jpg


Now it fits OK. Sorry, I took the pic before I cleaned up the file marks.
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That is some nice work.
 
Don'tkillbill said:
Did you paint the receiver? What did you use. I like the look!
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The metal was bead blasted and coated with Cerakote. I subbed that out to Tactical Ordnance. Cerakote is a ceramic-impregnated abrasion and salt-spray resistant coating that is heat-cured to give a thin layer of coloured ceramic over the metal. It's basically the same technology Beretta puts on its waterfowl guns to make them corrosion resistant.
 
Don'tkillbill said:
The magpul rear stock works like a charm I have one on my 12.5 Grizzly (tube fed)

If your interested at all the link shows "my little friend"

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The one thing I wish Magpul would do is offer a shorter MOE forestock that did not overlap the mag cap on guns where guys don;t want or need a tube extension.
 
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