2011 9mm Barrel Fitting Question

[Grant H.]

So, I am working on building a 9mm 2011, and I am working on fitting the barrel to the slide.

I got the hood fitted, the bushing fitted, and I have .0465 locking lug engagement.

I've built .45ACP 1911's and 2011's, but this is my first 9mm.

Is the barrel supposed to sit with a slope towards the muzzle? The back of the barrel hood to the top of the slide, at full lock is .0905 and the front of is .1005. It's not a lot of slope, but it is visible.

Is this normal with 9mm barrels? Do I just adjust the sights and call it good? Is something wrong with the parts?

This is a KKM Precision bbl and a Fusion 9mm Slide.

For those that like visual aids:
You can see that the Chamber area is sloped vs the slide.
https://c7.staticflickr.com/9/8099/29593380382_6b844b7bf9_z.jpg (https://flic.kr/p/M64NYf)0915161447 (https://flic.kr/p/M64NYf) by ARNEWB, on Flickr
It's harder to see in the picture, but the muzzle is slanted down as well.
https://c6.staticflickr.com/9/8156/29080185333_0b9f30da93_z.jpg (https://flic.kr/p/LiHxXK)0915161447a (https://flic.kr/p/LiHxXK) by ARNEWB, on Flickr

[BPTactical]

What is the slide lug engagement like?
Does this barrel have the fitting pads on the lug recesses?

[Grant H.]

What is the slide lug engagement like?

ETA: Thanks for stopping in Bert, I was sincerely hoping you would.

I missed a 0 on the measurement I shared earlier, .0465. If that isn't what you mean, then I am probably showing my ignorance, and would be happy to learn more.

Picture of slide lugs just for information, probably not necessary.
https://c5.staticflickr.com/9/8477/29081062164_54946f888c_z.jpg (https://flic.kr/p/LiN3Bw)0915161817 (https://flic.kr/p/LiN3Bw) by ARNEWB (https://www.flickr.com/photos/61071044@N08/), on Flickr



Does this barrel have the fitting pads on the lug recesses?

Not that I am aware of.

Picture of the top of the KKM barrel. Ignore the pencil mark that looks like a cut on the first/last lug (depends on which way you look at them).
https://c3.staticflickr.com/9/8556/29596422042_d638467866_z.jpg (https://flic.kr/p/M6kp9E)0915161816 (https://flic.kr/p/M6kp9E) by ARNEWB (https://www.flickr.com/photos/61071044@N08/), on Flickr

[Nivek]

Does it still have the slop when installed on the frame?

[BPTactical]

Does it still have the slop when installed on the frame?

This was my next question. How it sits in a bare slide is pretty irrelevant because the barrel link is not present.
Assemble the pistol and put some clay in the lug recesses on the barrel. That will give you the depth they are seating/engaging. That is a more critical dimension than the physical depth of the lugs. A fair amount of that engagement depth is relative to the length of the barrel link.
Your in a delicate balance when fitting the lock up on a 1911. The link has to be the correct length to seat the barrel correctly in the slide yet the relationship of link, lower lugs and slide stop must be maintained.
You have to think in the vertical of the barrel plus consider the arc it travels in.

[Grant H.]

Does it still have the slop when installed on the frame?

It's not really slop. It fits tight and locks up very solid, it just sits higher at the back than I expected.

I haven't gotten the frame completely fitted to the slide, which is the next task, and then I will be cutting the bottom lugs of the barrel for the slide stop pin. The only fitting that has been done on the barrel is the width/length of the hood. I lapped the bushing into the slide, but I haven't made any other changes on the barrel or the slide.

I fully expect everything to run right once I get it built, I am just wondering why the barrel sits slightly sloped compared to my .45's. If I have to adjust the sights to make it hit right, I can do that too, just curious if other people

[Grant H.]

This was my next question. How it sits in a bare slide is pretty irrelevant because the barrel link is not present.
Assemble the pistol and put some clay in the lug recesses on the barrel. That will give you the depth they are seating/engaging. That is a more critical dimension than the physical depth of the lugs. A fair amount of that engagement depth is relative to the length of the barrel link.
Your in a delicate balance when fitting the lock up on a 1911. The link has to be the correct length to seat the barrel correctly in the slide yet the relationship of link, lower lugs and slide stop must be maintained.
You have to think in the vertical of the barrel plus consider the arc it travels in.

Makes sense. I appreciate the feedback.

This is on an 80% 2011 frame, so I will get the frame and slide lapped in tomorrow, and then start from there.

My only question becomes this: When it's time to cut the bottom lugs, everywhere I have seen the process completed, the barrel is pushed all the way to the top of the slide, using a guide rod replacement that has a set screw, and then you cut the lugs. Will this not end up with the barrel sitting in the same position it is currently?

[Nivek]

Oops!!! I didn't mean slop. I meant to say slope.

[Grant H.]

Oops!!! I didn't mean slop. I meant to say slope.

Ah, that makes more sense. Thanks for chiming in, I'm hoping to get this squared away. It's just odd that I haven't noticed this in any of my .45 builds.

[Nivek]

No worries. I have built a couple 80% single stacks. I haven't dabbled in the 2011 world yet. I would get the slide fitted to frame and go from there. Like Bert said the barrel link is not in the equation yet. It's going to be great. Take your time and ask all the questions just to be safe.

[DFBrews]

I'm good friends with nivek and we have been talking about a 1911 9mm build does your frame have the .45 feed ramp cut out?

[Grant H.]

I'm good friends with nivek and we have been talking about a 1911 9mm build does your frame have the .45 feed ramp cut out?

It's cut for a Clark/Para Ramped barrel.

You can run whatever caliber you want, because the ramp is built into the barrel.

https://c1.staticflickr.com/9/8462/29675889736_25a96e6975_z.jpg (https://flic.kr/p/MdmG8j)0915162252 (https://flic.kr/p/MdmG8j) by ARNEWB (https://www.flickr.com/photos/61071044@N08/), on Flickr

2011 Paper Weight
https://c4.staticflickr.com/8/7589/26998723035_8208b247f5_z.jpg (https://flic.kr/p/H8MvJK)0513161942a (https://flic.kr/p/H8MvJK) by ARNEWB (https://www.flickr.com/photos/61071044@N08/), on Flickr

Clark/Para Ramped Barrel:
https://c8.staticflickr.com/9/8064/29630099311_beae37edb6_z.jpg (https://flic.kr/p/M9j1ee)0915162256a (https://flic.kr/p/M9j1ee) by ARNEWB (https://www.flickr.com/photos/61071044@N08/), on Flickr
https://c2.staticflickr.com/9/8519/29086580433_9b1bc38b6a_z.jpg (https://flic.kr/p/Ljhk16)0915162256 (https://flic.kr/p/Ljhk16) by ARNEWB (https://www.flickr.com/photos/61071044@N08/), on Flickr