Keyholing in my new rifle

clandestine · Aug 27, 2014

Don't take it to a Smith. This is a factory defect if there is one. Shoot a different brand of ammo and if its still shooting bad, send it back to Mossberg.

If you let a Smith do something and it still shoots bad then Mossberg wont warranty the rifle. Then your stuck paying for whatever is wrong.

awptickes · Aug 27, 2014

Looks like a factory defect, that looks damaged pretty badly.

Don't touch it, call Mossberg and have them make it right.

Be glad you didn't run it with a can. That could have been expensive.

lx1x · Aug 27, 2014

out of curiosity .. try shootng it without the thread cover.

maybe the barrel face and thread cover face not being flush is affecting the bullet.

Library Guy · Aug 27, 2014

Mr Montoya,

Could you post a picture of the holes the bullets are making? Sometimes there is some distortion simply from the type target backing used.

LG Roy

montoya32 · Aug 27, 2014

Library Guy said:
Mr Montoya,

Could you post a picture of the holes the bullets are making? Sometimes there is some distortion simply from the type target backing used.

LG Roy

I didn't take any pics, but the shots were not hitting the same spot consistently and keyholing. I am going to have to send it back to Mossberg.

awptickes · Aug 27, 2014

When you do send it back, send a target with it if you happen to have one still.

Petar · Aug 27, 2014

From the tread title I thought this was about Keymod handrails

sgt23preston · Aug 27, 2014

montoya32 said:
That was my first thought too. This rifle has no crown and I was shooting 5.56 ammo.

I picked up a few different types of .223 ammo to test.

I don't understand that the rifle has NO CROWN..?

My gut tells me it SHOULD have a crown..?

What do the rest of you guys think..?

sgt23preston · Aug 27, 2014

Boom Boom said:
Looks to me like the crown is unfinished. As if a manufacturing/machining step or two was skipped. I would expect the bore edge to be beveled.

That's exactly what I am thinking..?

ezracer · Aug 27, 2014

Boom Boom said:
Looks to me like the crown is unfinished. As if a manufacturing/machining step or two was skipped. I would expect the bore edge to be beveled.

That crown is VERY rough. It needs to have a chamfer. Brownells sells tools for doing this. If you wanted , you could take a brass slotted round head screw, fill the slot with valve grinding compound, place the screw in a drill motor, place the screw head against the end of the barrel ( where the lands and groove are ) and
SLOWLY rotate the screw just a little. You don't need much. Just a little bit of a chamfer ( bevel if you prefer ).

lx1x · Aug 27, 2014

montoya32 said:
That was my first thought too. This rifle has no crown and I was shooting 5.56 ammo.

I picked up a few different types of .223 ammo to test.

just saw this..

is the rifle chambered for 556 or 223?

maybe the cause of tumbling.

hgh pressure.

i have made a mistake once over charged a 9mm in glock34..was tumbling.. dropped my charge and it was shooting fine.

lx1x · Aug 27, 2014

ezracer said:
That crown is VERY rough. It needs to have a chamfer. Brownells sells tools for doing this. If you wanted , you could take a brass slotted round head screw, fill the slot with valve grinding compound, place the screw in a drill motor, place the screw head against the end of the barrel ( where the lands and groove are ) and
SLOWLY rotate the screw just a little. You don't need much. Just a little bit of a chamfer ( bevel if you prefer ).

meh.. op need to send it back rather than doing home remedy.

Pinecone · Aug 27, 2014

Send it back. They will fix it.

Stuff happens. I have had to send a couple of firearms back. One, a .22 pistol, they managed to forget to mill the feed ramp in the frame. :facepalm:

photoracer · Aug 27, 2014

lx1x said:
just saw this..

is the rifle chambered for 556 or 223?

maybe the cause of tumbling.

hgh pressure.

i have made a mistake once over charged a 9mm in glock34..was tumbling.. dropped my charge and it was shooting fine.

MVP is chambered in 5.56 not .223. It uses AR mags so I am guessing they chambered it in 5.56 so there would be no safety issues as it is sort of sold as a rifle to add to existing ARs so you have something more accurate. I have both also but I only use the MVP for varmint eradication and keep it down to 50-55g varmint loads. But I realise in a pinch I could slap in one of my AR mags that is loaded with green tip 62g mil-spec ammo without worrying.

boatbod · Aug 27, 2014

Take a q-tip with a drip of CLP or other gun oil on it and run it gently in/out over the crown. If there are any burrs they will catch the cotton fibers and you'll be able to tell really quickly.

A good crown, regardless of shape, does not have any burrs to snag on the bullet. Chamfering the edge is one possible solution, but frankly you shouldn't have to do that on a new gun, and really you have no way of doing it accurately with only hand tools and such an out-of-round starting point.

lx1x · Aug 27, 2014

photoracer said:
MVP is chambered in 5.56 not .223. It uses AR mags so I am guessing they chambered it in 5.56 so there would be no safety issues as it is sort of sold as a rifle to add to existing ARs so you have something more accurate. I have both also but I only use the MVP for varmint eradication and keep it down to 50-55g varmint loads. But I realise in a pinch I could slap in one of my AR mags that is loaded with green tip 62g mil-spec ammo without worrying.

Ok.. Thanks

antco · Aug 27, 2014

Send that back to the manufacturer. I'm with Chad on this.

Some crown examples-

-A little shooter of a factory bone-stock CZ452 .22LR-

-A Kidd barrel .22LR-

-A .187 MOA .308 from Tactical Operations-

-A .183 MOA 6.5x55 Swede from Tactical Operations-

montoya32 · Aug 27, 2014

I am likely sending it back. My description of a "crown" was originally referring to a chamfer. I have been told that some of the barrels on the MVPs have had a chamfer and some have not. I am going to go back to the shop I bough it from and have them send it back requesting a new barrel/repair and chamfer.

antco · Aug 27, 2014

As you can see, a visible chamfer isn't always the case. The TacOps rifles show a very obvious chamfer, the Kidd barrel shows a very, very small chamfer and the CZ shows a very small radius chamfer that hardly shows up due to my photography skills but that barrel is a little laser for factory work.

I'm not saying that your rifles keyhole problem lies 100% in the barrel crown. There are 10 other machining operations that could ruin the rifle but no rifle should keyhole with any SAAMI spec ammunition. Period. Send it back. I think you got a dud.

traveller · Aug 28, 2014

Another possibility is the end of the barrel not being machined plumb to the bore axis.

Keyholing in my new rifle

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