Extended Barrel Slants Downward

[omcforever]

i just installed a roto 4m 400 corbon in my RIA 45 5 inch model and the barrel where it extends out the end (1 1/2 inch) has a slight tilt downward. Point of impact has lowered 3 inches at 10 yards. Barrel locks up good/all areas look good/cycles and fires fine....HELP/ANYONE!!!

[John]

As far as I know, every barrel in a 1911 is tilted downwards a little. Put your standard barrel in the pistol and check carefully the muzzle end, you will see that the top is a little bit further out than the bottom.

Remember, it's still too early in the morning and no one can guarantee you that what I write at this time, is correct.

[Hacker]

Check with 1911Tuner in the gunsmithing forum...

[John]

I'll move that thread there.

[1911Tuner]

Normal. The 1911's barrel angles up at the rear as it goes to battery.
Time to file on the front sight, or install a taller rear...and maybe filing it a bit too.

You may help it a bit by installing a hard-fit bushing, which will pick the barrel up a little in the front. If the flared fitting pad on the muzzle is sitting outside of your stock bushing, it's tilting down an additional 4-6 thousandths of an inch. A bushing with a tighter ID will lift it up some...but you'll have to be sure that there's enough clearance for linkdown and barrel drop, and you'll have to reduce the flared part of the barrel to get the bushing on it. Basically, what you're lookin' at is to turn the flare off the barrel to diameter...install the bushing...then turn .006 inch off the barrel behind the fitting area for clearance.

Luck!

[pa_guns]

Hi

As long as the primers are getting hit dead center I would go after the front or rear sights.

Bob

[Joni Lynn]

In most handguns the faster the bullet and or lighter the bullet the lower it will shoot.
The two barrels may actually have the exact smae degree of tilt with it being more obvious on the longer barrel.

[1911Tuner]

Joni and Bob...

Filing the front sight will correct the POI, but won't help the loose fit between bushing and barrel unless the barrel OD is oversized. Most likely, it's flared at the muzzle to .580 and 7 or 8 thou smaller behind the flare...which would create about .010 inch clearance between barrel and bushing.

Three inches shift in impact at 10 yards is too much to be attributed to the
higher velocity. The higher speed would account for about an inch, but no more.

[Ericthenorse]

You could also try getting the right barrel for your gun.... Sounds like you got one made for a 6 inch slide....

[1911Tuner]

You could also try getting the right barrel for your gun.... Sounds like you got one made for a 6 inch slide....

Too late! Time to make lemonade now... ;)


omc...Where ya hailin' from?

[omcforever]

Too late! Time to make lemonade now... ;)


omc...Where ya hailin' from?

I HAIL FROM AIKEN S.C./ORIGINALLY FROM DAYTON OHIO...THANKS TO ALL FOR THE GREAT INFO.

[pa_guns]

Hi

I had missed the comment that the bushing was loose. I saw the "locks up fine" and thought that covered the bushing.

If you have a loose bushing then of course, that needs to be fixed. It will bug you to death otherwise.

Bob

[Ericthenorse]

The only problem I see there, is I believe it was said that the end of the barrel was slightly flaired A LA series 70... If thes is the case, it might cost more to get the barrel turned dwn than to get a new barrel.... I am not sure how much this perticular one is worth though, so I might be wrong....

Where is the barrel from??? I mean, where did you purchase it???

[1911Tuner]

Aiken is 200 miles, give or take. If you'll get a hard-fit bushing and bring the gun to me, I'll fit the bushing and turn the barrel for clearance. N/C

Easy directions and not far off I-85...60 miles from the 85/77 junction in Charlotte.

Your call. Standin' by...

[pa_guns]

Hi

Three hour drive, free lemonade, free custom fit bushing job.

Can't beat that.

Bob

[variac]

From my experience it sounds like the people who mentioned bad barrel/bushing combo are most likely right, however I installed a .003" longer barrel link in my home built custom 1911 and noticed that it shot lower than normal too, the firing pin mark was off center on my primers also. I have a 3 dot sight and lowered the front sight by milling a small amount off around the base of the front sight (very delicate work) but it still tends to shoot low if you arent used to that particular pistol. my barrel/bushing match up is good, it's just the barrel link I used in order to get a good solid lockup.

[1911Tuner]

my barrel/bushing match up is good, it's just the barrel link I used in order to get a good solid lockup.

Howdy variac, and welcome aboard. Hate to rain on your parade, but that ain't what the link is for.

The sole function of the link is to get the barrel down and out of engagement with the slide. Aside from that, it's just along for the ride, and shouldn't be used to get a tight vertical engagement in the slide.

[John]

Yeap, I was going to say that. The link is just for the unlocking.

The barrel needs to lock by its legs, on the slide stop shaft, if you are looking for proper functioning.

[Helstrm]

I never knew how many members were in SC... Or very close by. We should put together a range get together.

[1911Tuner]

Yeap, I was going to say that. The link is just for the unlocking.

Not to mention the linkdown and drop timing gets delayed with a long link...which can cause all sorts of expensive problems if it's just a bit too much. Also not to mention that...if the link is long enough to cause the barrel to cam up into engagement, it places stresses on the link, its pin, and the pinhole in the lower lug that they were never meant to handle.

Dinkin' around with links and different center-to-center lengths is a slippery slope...
Sliiiiiippery.