Grizzly Choke Tube

go to a Home Hardware, get a can of KP53 penatrating oil. fill a bowl full of the stuff and set the end of the barrel vertically into it and leave it for a half hour I had to do this to an 870 one time and it freed it right up.
 
I sent them an email. Doesn't look damaged. I shot slugs through it and the issues choke tube is pretty tight at .700 it rates as an improved modified. Would the slugs seize the tube? I would have thought a gun like this was set up for slugs but the issue choke is strangely tight.

I 'd prefer to not ship it back as this is prime canoe season for me. One thing that bothers me about the Grizzly is it is shipeed with no documentation at all. A bit of info included in pamphlet form wouldn't kill anyone.

IE... Here is how to remove the choke tube...Yes it is a 3" chamber despite the confusing markings on the barrel ect.
 
I have no reason to remove the choke in mine...I removed it when I first got it oiled the threads..I see no reason to replace it ..shoots everything slugs 2-3/4 and 3 inch buck etc...Chokes will get hard to remove if you don't lube the threads. I down loaded the Remington 870 manual for dis-assembly and reassembly..
 
Thanks all. I made a wrench to fit and can now get a fair bit of torque. Soaked the muzzle in liquid wrench for over an hour. No dice. Tried light hammering to loosen it up...no movement. Might as well be welded in. As I have had the gun for about 2 weeks and counted 57 hulls fired.

The existing choke on it is .700 which is like an improved modified and to tight for best use for slugs IMO. I'd love to switch over to an IC and paid 75.00 for a set of chokes that are now useless. I get really irritated with things that aren't made to work and the removable choke on my tube will need a gun smith to remove. Any more torque and I risk damaging the gun.

On a good note the heat treat is good as I haven't marred the wrench indents even with a bit of mistreatement with the quarters. Anyway the "removable" choke on mine is a pretty poor effort.
 
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Holy....

luckily you are working on Grizzly. Remington would have voided your warranty.

Call CanAm and explain your situation. Maybe you can borrow a barrel (or a new gun) for now.
 
It's now sat immmersed in liquid wrench for 12 hours... I have made a wrench that fits well. No way this will move without wrecking the choke. I'd suggest folks who buy these remove the choke as soon as you buy it and lube well. If it doesn't move ship the bast&$d back.
 
I used a rifled choke before. Everyone else thought I was shooting a muzzle loader - I have to lose the choke after every shot.
 
18 hours in penetrating oil. Wrench in the vice... easily 100 pounds of torque. No movement. The removable choke on my Grizzly is officially a peice of crap.

Rest of the gun looks good but this has pissed me off a fair bit. e-mail sent to Canadian Ammo but I need a bear defense gun that I have wrung out for the next month so we shall see.
 
Did you try tapping on the choke (straight down from the muzzle) gently?
I just unscrewed mine and it has very fine threads on it. I wonder if the force of the slugs hitting it bound the threads up..
I'm just throwing out idea's..this is my first shotgun with removable chokes.
 
I took a 25cents and removed mine with absolutly no force, it was well oiled.

Send it back to CanAm

BTW, the stock choke is supposed to be a Modified.
 
Striker said:
Did you try tapping on the choke (straight down from the muzzle) gently?
I just unscrewed mine and it has very fine threads on it. I wonder if the force of the slugs hitting it bound the threads up..
I'm just throwing out idea's..this is my first shotgun with removable chokes.
Click to expand...

Yes I have tapped, frozen, heated, twisted and soaked the choke.
It aint gonna move.
 
Icefire said:
I took a 25cents and removed mine with absolutly no force, it was well oiled.

Send it back to CanAm

BTW, the stock choke is supposed to be a Modified.
Click to expand...

Mine measures .700 which puts it closer to Improved Modified and isn't what you want for slugs IMO. Out of interest maybe measure yours and report back. Could be I had a too tight choke which has seized up from slug impacts.
 
Mine is .702 which indeed look like an imp. modified.

but unless you use older type slug that should only be fired in cylinder choke, new slug can go in nearly all chokes.
 
Chris from Canada Ammo got back to me. Very accommodating and they stand by their product well. I'll send it in after canoe season for them to look at. In the mean time it shoots well as is. Would like to experiment with the different chokes but it can wait.
 
I got my new ghost ring sight, 12.5" barrel, removable choke Grizzly last week. I did the usual clean and inspect before taking it to the range. Part of my pre-shoot check included removing the choke tube and cleaning and lubing the choke threads with synthetic grease. Both the choke tube and barrel threads appeared well made and the choke tube screwed in smoothly.

I fired a box of 1-1/8 oz target loads first, and when they were gone I took the choke out to see if there was any plastic fouling on it. It looked fine so I re-installed, it screwed in smoothly.

Next I fired a couple of boxes of slugs. When I got home I got to cleaning the barrel and of course I tried to remove the choke. It did not want to come out using a quarter for a wrench, despite a fair bit of force. Hmmmm...

Using a "T" type choke wrench that I have I was barely able to unscrew the choke from the barrel. I tried another choke and it screwed in without problem, so it looks like the barrel is ok. However the choke that came with the gun appears to have deformed at the bottom, the base of the choke looks to have been pushed out and because of this it was almost locked into the barrel. Another box or two of slugs and I doubt that I could have removed the choke tube.
 
When I first got my 12.5 inch I stripped and cleaned it, no problems removing choke. The choke measured .702, definitely in the improved modified range. A bit too much constriction for slugs I would think. I'm going to install an improved cylinder choke on mine. I'll pattern bird and buck with both chokes just to see, but will stick to slug in the improved cylinder one.
 
Choke tubes are bored larger at the rear, with the constriction or choke coming further ahead in the tube, towards the front. They need to be made this way so that the the shot does not "run into" a ridge at the back of the tube.

The choke in my Grizzly became deformed at the rear, where it was already bigger than the bore diameter of the gun. Perhaps this tube was made of steel that was a bit too soft or has not been properly heat treated.
 
My choke measures about 0.69" and turns with ease. Haven't fired any slugs yet but may hold off until I get my hands on some new chokes. The breach end of the choke sits well below the barrel sides and does not appear to create a lip that could catch projectiles.

Is the barrel chrome lined? The reason I ask is that my barrel is very rough inside for about the first 4.43" than transitions to shiny as if it were chrome lined, normal?

Also, finish appears to be a little susceptible to corrosion.

All said,
I Love this thing & think it is very good value! Thanks CanAm!!
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