2.0 barrel, 1.0 slide fitment

[jaxt]

I have a 1.0 9c

Bought a 2.0 compact barrel



The barrel fits in the slide fine, goes into battery, feeds snap caps, etc. But by hand, the slide will only travel 90% of the way back for locking, but as it almost gets there the barrel binds up.
I have used sharpie to show me the wear marks.

The front/top of the hood is getting binded to the underside of the slide. I have to tap the back of the slide to get it to release (without the slide catch being engaged).


Should/could I attempt to fit it to the slide or just accept the incompatibility (where to take material from? shave the angled hood? shave the underside of the slide?)

 

[WR Moore]

OK, the locking block of the 1.0 and 2.0 are different. Not having examples of the 2.0 on hand, I can't tell you where the differences lie, except that the 2.0 has much longer slide rail bearing surfaces. I'd expect there may be other differences on the barrel camming surfaces. Dunno about inherent differences between slides.

DON'T FUTZ WITH THE SLIDE!!!!!!!!!!!!!!!!!

I'd see if you can return the 2.0 barrel or maybe trade it for a 1.0 barrel. Gunpartscorp (Numrich) has factory new compact 1.0 barrels in both 9 mm and 40.

 

[jaxt]

Luckily, I have both locking blocks. To the eye, there are more similarities than differences. I modified the frame to accept the 2.0 block btw.



(The whole reason for getting the 2.0 barrel, was I'm just the tinkering type and wanted to upgrade but using factory parts. The 2.0 setup would gain barrel twist, lug, locking block rails, timing/dwell and lockup improvements. If I bought a 1.0 barrel, i'd have to know specifically what production run it was, since S&W did a lot of rolling changes at one point)


Ive done some more experimenting though, including taking some material from the top of the barrel hood. This helped, but still no cigar overall.


With the 1.0 locking block, the 2.0 barrel only binds VERY slightly (would work itself out after a range session, therefore fully usable). Also it binds in a different part of the slide.

With the 2.0 locking block, the 2.0 barrel starts to bind earlier. My 1.0 barrel works fine with the 2.0 locking block.


Seemingly, the only difference when changing the locking block, is where the slide binds at, sooner or later. So id say the 2.0 lug design is causing the camming differences not the LB itself.



I can either use the 2.0 barrel with the 1.0 locking block. Or use the 2.0 locking block with the 1.0 barrel.
But I don't gain what I set out to accomplish with this. Better locking block (longer rails) but worse barrel. Or better barrel with shorter rails.


Unfortunately I can't really put anything more into this upgrade experiment.

Selling the barrel itself won't cover an aftermarket barrel nor a 2.0 slide to match the 2.0 barrel.

Breaking even is now the goal.

 

[jaxt]

Well I took a breather to sleep on this.

I got it to work. 2.0 barrel in 1.0 slide with some minor smithing.