340SC improved...

[robotoid]

Yesterday I finally had time to play with some parts I bought from Brownells. I have a 340SC that I had relegated to the safe because the trigger pull was sooo terrible. Yesterday I opened it up and used some Mothers polish inside the frame where the rebound spring block rubs/touchs, the trigger touchs, and the hammer touchs. I also used the polish on those 3 parts (trigger, hammer, rebound slide) contact points as well. Then I installed the ISMI spring kit a got from Brownells, which they advertise as a standard power hammer spring and a 10% reduced 16.2LB rebound spring. Lubed up all the polished contact areas and put it back togther. The trigger pull is now fanastic, on par with my other J frames. I also installed a Meprolight night sight on it. This is the third time I have swapped front sights on this gun, and probably the last. The pin hole in the aluminum shround is starting to get oversized and out of round from too many drilling touchs.

 

[robotoid]

Yesterday I finally had time to play with some parts I bought from Brownells. I have a 340SC that I had relegated to the safe because the trigger pull was sooo terrible. Yesterday I opened it up and used some Mothers polish inside the frame where the rebound spring block rubs/touchs, the trigger touchs, and the hammer touchs. I also used the polish on those 3 parts (trigger, hammer, rebound slide) contact points as well. Then I installed the ISMI spring kit a got from Brownells, which they advertise as a standard power hammer spring and a 10% reduced 16.2LB rebound spring. Lubed up all the polished contact areas and put it back togther. The trigger pull is now fanastic, on par with my other J frames. I also installed a Meprolight night sight on it. This is the third time I have swapped front sights on this gun, and probably the last. The pin hole in the aluminum shround is starting to get oversized and out of round from too many drilling touchs.

 

[tmbrcruizr]

Thanks for the info, working on the same project for my 340 and 342. The 342 seems to have a better stock trigger, maybe shot more?
The mothers polish sounds like a good idea, I was hesitant to take that 12" bastard file to the case hardened trigger. I am on my second sight on my 340, and think I will stick with the Hi-viz.

 

[robotoid]

I forgot too, I hit the rebound spring block with two or three rubs on a fine sharpening stone before the polish. I only did it on the bottom and the right side, the left side had depressions from the MIM moulding I didn't want to risk messing up.

 

[bronco45]

I love the Meprolight night sight I think it is the best out there. Bigger and brighter than all the rest, along with a square configuration that makes a dandy sight picture in daylight.

 

[folkenheath]

Nice job on the trigger. I just did the same thing to my 342. Fine india stone (per the Miculek video), then polish with mothers. Except I bought the Wolff rebound spring kit. Tried the 12 lb and it worked reliably, so I will use the 13 lb for a safety factor. By the way, if you removed everything but the trigger and rebound slide, the trigger pull force for that spring alone was ~4 lbs for the 12 lb spring, ~4 1/4 lbs for the 13 lb spring, and ~5 lbs for the stock spring. My sear surface was factory ground very crooked, so I ordered a new one, once that comes in I will fit it and then reassemble and measure the new DA trigger force. I left the stock hammer spring in. Stock trigger was 12 - 13 lbs. It's fun to tinker with the guns, take your time and do it right and it gives you some satisfaction with the results.

 

[robotoid]

Originally posted by bronco45:
I love the Meprolight night sight I think it is the best out there. Bigger and brighter than all the rest, along with a square configuration that makes a dandy sight picture in daylight.

Yes, I was not too satisfied with the XS Big Dot Tritium I had on this gun previously. It just threw the whole sight picture off too much with the too tall round sight in the square rear sight notch. I have not shot the gun with the Meprolight on it yet. I am mildly concerned that the tritium insert is slightly off center in the sight itself. Also, to line up the tritium dot in the rear sight requires the top of the front sight to be high/above the rear notch. We'll see when I get to the range with it in the next few weeks. It's not going to be a long range target gun I guess. I bought a second Meprolight to put on my 640-1, but am holding off installing until I shoot this one. I may try a Hi-Viz on the 640-1. I just can't seem to see black front sights anymore, silver/SS no problem.

 

[Spotteddog]

Robo,
If not too much trouble, could you post a link to the Meprolight front sight your using?
Thanks!

 

[robotoid]

Originally posted by Spotteddog:
Robo,
If not too much trouble, could you post a link to the Meprolight front sight your using?
Thanks!

This looks like the same one but I got it from Brownells.

http://www.midwayusa.com/eproductpage.exe/showpage?sale...e&utm_campaign=10636

EDIT: Reading the Midway customer reviews, I see the slightly off center tritum dot is apparently a common problem.

 

[Spotteddog]

Thanks Rob!
I'd read the same thing from another Forum member a while back. He'd gone as far as ordering a half dozen of them. He said he's found two out of the 6 that had correctly positioned vials. He then returned those that were off a bit. Nice product, sure wish they'd up their Q/C on these though?

 

[bronco45]

Night shooting is a long ways from bullseye. That dot gives you a flash sight picture. It will work perfectly well if a few .000s askew.

Big thing is to identify the threat, react accordingly and be able to place your bright green dot on the threat and squeeze/press the trigger. In all likelihood the shooting will be close and fast.

 

[Spotteddog]

Point taken Bronco!
"Never let the perfect, be the enemy of the good" the saying goes...