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Need help picking up a Mossberg 500A foregrip.

Discussion in 'Shotguns' started by Mags, May 21, 2009.

  1. Mags

    Mags Well-Known Member

    Apparently mossberg changed their mag tube design and some after market foregrips will not fit models produced after 2006. I purchased my mossberg in 2006 so how can I tell if mine falls under the new design?
  2. RandKL

    RandKL member

    Simply put, if your gun came with a wood forearm, yours is a Mossy 500 forearm/action tube. If it's plastic....

    If the action bars, the two bars that attach to the forearm, are riveted directly to the plastic, it's a Mav 88 forearm and you can't be replaced with an aftermarket one as is. You'd need to replace yours with a Mossberg 500 action tube to be able to use aftermarket grips.

    If the bars on yours attach to a steel tube that the wood or plastic forearm is slid down onto and there's a 2 notch nut at the front that can be unscrewed, yours is a Mossy 500 action slide tube and aftermarket grips will fit as long as they're the right length.

    This is a 500 slide tube. The bars attach to the tube, not the wood or plastic forearm.

    This is a Mav 88 forearm. The bars are riveted to the plastic and there's no steel tube.

    Length....newer Mossy's have a 6 5/8" long action slide tube....again, the steel tube the wood forearm slides down onto. But, pretty much all, all I've ever seen, anyway, aftermarket forearms are made to fit the older 7 3/4" action slide tubes.

    Remove your forearm from the slide tube if you have a slide tube and measure the tube from the back edge of the solid ring the bars are pinned to all the way forward to the front edge of the threads. No nut. If yours is 7 3/4", you're ok.

    Just finished measuring a few foregrips here in the shop. The ATI AR-type foregrip will fit the shorter tube (it has a molded in line where you cut it to fit) as will their "standard" grip. Their older Thompson style won't, but it can be trimmed to fit, too. Speedfeed won't, but it's almost identical to the Mossy standard synthetic and Mav 88 corncob so just buy a Mav 88 grip if you want that look. Ram Line won't. Pachmayr won't.

    Hope this helped.


    Last edited: May 21, 2009
  3. Mags

    Mags Well-Known Member

    Thanks for your help looks my tube is the smaller 6 and 5/8
  4. Badger Arms

    Badger Arms Well-Known Member

    K850xxx is the cutoff from old to new.
  5. Badger Arms

    Badger Arms Well-Known Member

    Attached Files:

  6. Mags

    Mags Well-Known Member

    Just recieved the hogue adapter from Midway USA looks like I am going to have to dremel out the inside of the stock for it ti fit but it will work eventually.
  7. RandKL

    RandKL member

    Didn't notice this or I would have said at the time....the Hogue adapter isn't for fitting their stock to shorter action slide tubes. That adapter was meant to mount *their oversized grip* to standard tubes. It's not the right size for the purpose you intended it to be used for. As you found out, it will take some good fitting to get it to work in that regard. I made a post comparing those very "adapters" a couple of years ago. I'll see if I can find it later.

    Ok, I found it. This is cut and pasted from that earlier post:

    ""Ok, the Hogue adapter is exactly 1 5/8" long so it has the length....but there's a problem. If you're trying to install a ribbed synthetic forearm on your gun there's four narrow plastic rails inside the forearm that block the adapter thickness from fitting in. Those could be relieved with a Dremel sanding drum quite easily....*BUT*, the adapter runs out of threads on the tube before it socks the forearm down snug on the tube. A wooden forearm is even worse. The adapter is close to a half an inch too long for a standard Mossy wooden forearm. Again, you can Dremel the adapter about a quarter inch shorter....but it's still a trial and error job.

    If you're handy with a Dremel, you can fit it nearly factory perfect. If you're not, it's not going to be much of a problem with it hidden inside the forearm and all. Me, I'd grab one and cut it in a heartbeat, but I have a great lathe. 7 5/8" forearms aren't rare, though. They pop up on gunbroker all the time and even Ebay now and then. You can spring for an adapter that takes an hour to fit or a $20 action tube that fits perfectly right off. Up to you, bud.""

    Your best bet, read that as easiest, would have been to just go to gunbroker and pay $20 or so for the right sized action slide tube. They aren't rare by any means.


    Last edited: Jul 3, 2009
  8. Mags

    Mags Well-Known Member

    Thanks Rand that is exactly what I will be doing as I am putting the adapter on the ribbed forend. Hindsight is 20/20 and looking back I do wish I had purchased the longer forend but I got 12 bucks in the adapter so I guess I will make it work.
  9. RandKL

    RandKL member

    RM, just looking at that post of mine....and I'm not quite awake just yet so I may be wrong but it's worth mentioning....the adapter is only half threaded, so that means you'll need to remove about 1/4" from your slide tube, not the adapter. With your tube shortened and the longer adapter, you should get the size matched pretty well. Screw them both together outside your grip and then lay them beside your grip to get a rough measure on it before you proceed.

  10. Mags

    Mags Well-Known Member

    Thanks for the added info.
  11. JimmyNeutron

    JimmyNeutron New Member

    Hi chaps. Hope you all don't mind a Limey asking questions on your forum but finding answers in the UK isn't too easy?! :)

    I have a Mossy 500A Serial Number T357*** and from reading RandKL's posts I have the Mav88 Forearm (bars being riveted directly to the plastic). I am ideally after replacing the forearm with a Hogue overmoulded or something similar but am a little unclear as how to go about it. I know I need to replace the action slide but can't work out if I need the 6 5/8" or the 7 3/4" action.

    I'm guessing I need the 7 3/4" but can someone explain where I need to measure from and to on the Mav88 forearm?

    Thanks all

  12. RandKL

    RandKL member

    You don't need to measure the Mav part, Jimmy. Those are all the same size. The size refers to the Mossy 500 slide tube that you'll replace your Mav forearm and action bars with.


    On this slide tube, you'd measure it from the back edge of the thick steel ring the bars are riveted to all the way to the front edge of the threads on the tube. Really older Mossy's used 8 7/8" tubes. More modern ones used the 7 5/8" (7 3/4" to most folks). Those are the ones that most aftermarket forearms were designed to fit. Newer ones use an even shorter 6 1/2" tube. Some newer forearms, the ATI "standard", the ATI AR-type etc will both fot the short tubes. Just check your intended aftermarket forearm for a size and buy the right tube. If it doesn't list a size, it's a 7 5/8" pretty certainly.

    If you need anything else, bud, let me know.

    Be safe!

    Last edited: Jul 7, 2009
  13. JimmyNeutron

    JimmyNeutron New Member

    Thank you for clearing that up Richard. I'll get ordering the new goodies tonight; it's a shame I have to wait for parts to come from the US!
  14. faizi

    faizi Well-Known Member

    I read some where here that new model Mossberg 500 doesnt have slide tube assembly any more.it comes with almost same forend assembly like Maverick 88.the action bars r attached directly to the forend.
  15. STxRynn

    STxRynn Member

    Newer Shorter action tube??

    I bought a 500A the other day. Pawn Shop.

    The action tube is 4 3/4 inches long. The slide bars are 6 1/2 inches from the base of the tube to the ends.


    Looks like they changed it again!!!

    I think it'll be easier to just get a long one than go thru the adap trials....

    Take care.
  16. HyprHyrb

    HyprHyrb New Member

    I have the new Mossberg 500 with the crappy Maverick 88 forend. Well I replaced it with a 7 5/8" Slide tube and nut, with the Hogue overmolded forend. With it installed everything works perfectly on the gun but when the action is open the forend doesn't sit flush like most forends do. You can see about a half inch of the slide bars. Check the Pic

    Do I actually need the 6 1/2"? Like a said the gun is fully functioning and all other tolerances are perfect, just the gap in the pic. What you say?
  17. RandKL

    RandKL member

    H, your pic isn't coming up, bud. Can you try that again? If necessary, send me an email.

    Ummm, skip that. It came up.

    That's perfectly normal, Hypr. Different forearms fit to different lengths is all. The reason they've been going short like that is that a *lot* of folks use screw on side saddles these days to hold extra shells on the receiver and long forearms don't work with full sized sidesaddles. Slings are another thing. If you use a sling and the forearm hits the receiver, there's a chance the forearm can pinch the sling and in effect jam the pump motion. Yours is a perfectly normal Hogue. It's pretty close to the same length as the Mav 88 forearm, in fact.

    The original Mossberg wood corncob overlapped the receiver by about two inches....it was great wood but really poor tactical!

    The new ATI universal forearm doesn't even cover the action bar joint on the forearm tube. They made sure theirs works with all the add ons.

    Last edited: Sep 17, 2009
  18. HyprHyrb

    HyprHyrb New Member

    Ahh very good sir. Thank you for the info. Ya I just put a hogue tamer on their too the hogue forend/pistol grip feels awesome and very comfortable. I can't wait to go shoot it.

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