Need help with a 8.5" Grizzly and SpecOps / Knoxx Stock

Fusilier

Fusilier

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I installed a Knoxx Stock on my Winchester 1300 years ago and it went just fine. Now I'm having a real ##### of a time installing a new Blackhawk SpecOps stock on my new 8.5 Griz.

I've taken the old stock off and in the process, I unscrewed the adapter nut off the back of the receiver. No problem (once I figured that out) - I've recovered the nut from the front of the old stock.

Now I try to install the new stock and for the life of me I cannot get the mounting screw to turn far enough into the adapter nut. I even took the adapter nut off the receiver and tried to torque it onto the mounting bolt (I figured I'd get it well started and then screw it into the receiver once already attached to the mounting bolt. I tried using the long hex key that came with the stock and I tried using a same size hex key but shorter one (the shorter one was a lot easier to control). I got the adapter nut part way onto the mounting bolt and then I torqued the end off my shorter hex key - the hex key ball head broke off completely. The ball head is not stuck in the bolt - the bolt hex head is clear.

Now I can't get the adapter nut off the stock's mounting bolt. I can't get the adapter nut further onto the stock mounting bolt. This means I can't even put the adapter bolt back onto the receiver and mount the original stock back onto the shotgun. The adapter nut is firmly stuck on the end of the SpecOps stock's mounting bolt.

At the moment I have a $400 shotgun I can't use and a $150 stock I can't use and I'm too tired and too frustrated to mess with it anymore tonight.

Anyone have any suggestions on what to do next? There aren't even any real gunsmiths I know of here in Halifax so I might even have to ship the damn things somewhere to get it fixed. I might try to see if Navy Shooter could do anything with this in his machine shop when he has time.

Any help, pointers or ideas are more than welcome. Any offers to 'take it all off my hands' will not be responded to. :)

Thanks,
 
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Drill the rear stock hole larger & remove the bolt. Run a 1/4 x 28 die over the knoxx bolt, A very small amount of metal will be removed. Install new stock!
 
OK it makes sense now. I had thought the bolt was a ##### to install because of the nylon locking feature in the bolt. Stupid me for not checking the threads first.

Now my problem is how to get the damn Receiver Stud (to use the correct term) off of the bolt on the stock. I'll try WD-40 and I'll give it some time to seep in to see if that'll help me get it off of the stock bolt.

If I have to cut the damn Receiver Stud off of the bolt, will a Remington standard stud fit in the threads in the back of the receiver? Brownells has the stud in stock and they cost less than $5.00. I've screwed up more expensive bits but I'd hate to then find it won't fit into the receiver and I'm still faced with getting one part or the other re-tapped.

Thanks again guys.
 
you dont need a special allen key to install the knoxx stock. ball head allen keys suck and are one of the reasons for so many stripped bolts.

grab the locking lever on the adjustable part of the buttstock and lever it up all the way, then pull it right off - so youre just left with the 'buffer tube'-like thing. this will let you access the stock bolt hole much easier and you can use a standard allen key or long allen socket on it. if you dont have one that can reach you can make an expedient one with the remains of your short allen key - just cut it into a straight rod, grind the ends flush, and use it in a same sized socket to turn it. keep it as short as you need to reach the bolt to keep it from twisting.
put the nut in a vise, and make sure you tap the allen key into the bolt with a hammer before turning it.
 
In case anyone is interested, I've got the Receiver Stud off the bolt, opened up the hole in the stock and removed the bolt, and now to either clean up / resize the bolt of find a new metric bolt to fit this sucker.

I have a small tap and die set but the only 1/4" die I have is a 1/4 x 20NC. I'll have to search around for a 1/4 x 28. Sounds like a pretty fine thread. Anyone know what the actual thread is in the Grizzly's Receiver Stud?
 
its strange that people are having problems with the thread. i had absolutely none - i used the factory Speedfeed bolt to mount it on my Grizzly and just a screwdriver to tighten.

are you sure the bolt isnt bottoming out on something?
 
The grizzly is 1/4 x 28 imp(fine) threads. The knoxx threads are the same, just a little large & need to be cleaned up. The new batch of Knoxx seem to fit with no cleaning up. I have installed a lot of these.
 
I picked up a 1/4 x 28 fine hex die and ran the Knoxx stock's bolt through it. Used oil and ran it up and down about 6 times. I still cannot get that darn bolt to seat more than 1/4 of an inch into the Receiver Stud. The long bolt that held the original stock on the Griz still runs into the Receiver Stud for about an inch - a lot further than the Knoxx stud.

Either the Knoxx bolt is slightly thicker than the Grizzly stud or the Grizzly stud is a little smaller than standard. Since the Grizzly's bolt runs through the hex die just fine, I tend to believe the Knoxx bolt may be at fault.
 
Fusilier said:
I picked up a 1/4 x 28 fine hex die and ran the Knoxx stock's bolt through it. Used oil and ran it up and down about 6 times. I still cannot get that darn bolt to seat more than 1/4 of an inch into the Receiver Stud. The long bolt that held the original stock on the Griz still runs into the Receiver Stud for about an inch - a lot further than the Knoxx stud.

Either the Knoxx bolt is slightly thicker than the Grizzly stud or the Grizzly stud is a little smaller than standard. Since the Grizzly's bolt runs through the hex die just fine, I tend to believe the Knoxx bolt may be at fault.
Click to expand...

Call Mike at the shop on monday 1 (866) 960-0045.
 
Canada Ammo said:
Call Mike at the shop on monday 1 (866) 960-0045.
Click to expand...

Will Do. I didn't want to call until I was sure it was something on the Griz and not on the new stock.

I just got back from Home Depot and I checked out the Grizzly's Receiver Stud and the Knoxx Stock's bolt on the little set of standard size bolts/nuts in their hardware aisle. I can confirm that the Knoxx bolt is OK and it is the Grizzly's Receiver Stud that is a little too tight. I could not get the Receiver Stud to screw onto the standard 1/4 x 28 F bolt but the Knox bolt screwed into the standard 1/4 x 28 F nut just fine.

I figure I can either try to get the Receiver Stud chased out to the correct ID with a good tap or just replace the Stud with a new one. I'll see what Canada Ammo can help with. Now that I know what the problem is, this should be relatively cheap to sort out.

Thanks for the help everyone. I'm off to Kingston Ontario for mil training next week so I'll be off line unless I can get my lap top to work in Fort Frontenac.
 
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Bumpity,

Just jumped headfirst into the same boat as Fusilier, I sent a PM, but I think he's still off-line. So, how do I get the bolt out so I can run it through the 1/4x28 die? Or is there an easier way? I stopped myself before I did his original idea of just forcing the bolt in until it gets stuck, thankfully.

BTW, jumping headfirst INTO a boat, is not necessarily a recommended technique, OUT of, sure, but not INTO.
 
Some dies have a little set screw in them, if you back it off it makes the die smaller and if you tighten it makes the threaded portion slightly larger. Hope this helps. Also if your at the hardware store you can buy a single 1/4 -28unf ( unified national fine) machine screw to help set up your die or even the matching tap if you have it.
 
I'm back off of vacation so I plan on picking up the 1/4 28 tap this week. If this works out, and I see no reason it should not, then I'll offer the tap up for anyone who needs it for similar purposes. The only cost will be to mail the tap to the next person that might need it. I know that tools like taps and dies are not typically the things one wants to borrow or loan out but this is a single purpose tool for most of us and since we're just cleaning up an already tapped hole, any slop should very minor (if any) and should not be the cause of any real problems for this purpose.

I just found out that Busy Bee tools has the right tap on sale at the moment for $3.99. With luck I'll have the stock installed tonight.

Stand by for further updates.
Cheers,
 
Finally success. I ended up running the Knoxx stock bolt through the die again and I cleaned up the Receiver Stud with the new tap I just bought at Busy Bee Tools. It all worked and the stock is on the gun now.

Now I have just one last question for you. It has been so long since I took all this all apart that I now have a small lock washer in my parts bag and I can't remember if I need to put that back on the Knox stock's bolt. I just can't remember if it was in there when I took the bolt out of the stock the first time.
 
Fusilier said:
Finally success. I ended up running the Knoxx stock bolt through the die again and I cleaned up the Receiver Stud with the new tap I just bought at Busy Bee Tools. It all worked and the stock is on the gun now.

Now I have just one last question for you. It has been so long since I took all this all apart that I now have a small lock washer in my parts bag and I can't remember if I need to put that back on the Knox stock's bolt. I just can't remember if it was in there when I took the bolt out of the stock the first time.
Click to expand...

Put the bolt partially through the stock hole, Then install the lock washer so it ends up at the head. The O ring then goes on the receiver side at the threads to hold the bolt in place. I always locktite the threads as well.
 
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