Lightest MainSpring that can be used and be reliable in .45?

[sasquatch981]

I have 17lb mainsprings in my other (2) pistols but they are both .40's. What is the lightest spring you can use in a .45 and still have 100% reliabilty? I just bought a new SA TRP and the trigger is nice, but comes in at 5.5lbs. I would like to get it down to ~3-lbs. I know that I can monkey with the sear spring, but the Main-spring has to be part as well. I am hoping a drop to 17-18lbs will allow reliabilty and a slightly decreased weight as well. What about a titanium cap, and strut? Will that help with weight, or just lock time and "cool-factor"?

[CSEMARTIN]

When I tried to run a 17# spring, I had light strikes. Now, I run only 19# mainsprings and have never had a problem. My trigger is 2.5#'s and is 100% reliable.

I had a gun with titanium parts, but I didn't notice a difference.

[EkuJustice]

From What I have seen the MS is minimal. My smith did one on my 9mm 1911 that is sub 2 pounds with a 19pound MS

[fastarget]

your gun probably came from the factory with a 19, a change to 18 or a 17 could change the trigger by a few ounces (4-6), I run 18 in mine......combine that with a little adj to the sear spring could get it down in the 3s, but to get it real light a good gunsmith to change the sear/hammer angles.

[rcc96]

15lbs ISMI no problems...

[ParaGunner]

Going from a 23lbs to a 17lbs mainspring will only drop the trigger pull weight a quarter of a pound. Try a Infinity tri-glide sear spring ,it's a cheap way to get your pull where you want it. You will need to tune the spring though.

[2MoreChains]

I tried a 17 lb MS a few years ago but ditched it because I was getting light strikes. Went with an 18 lb spring, and haven't had a problem since. I now use 18 lb mainsprings in all of my 1911's and 2011. Mostly use Winchester or CCI primers.

[soaringf22]

i use a 17lb mainspring in both .45s but also use an extra power firing pin spring. it sets off from federals to cci's to wolf primers.

[TonyT]

I have 17lb mainsprings in my other (2) pistols but they are both .40's. What is the lightest spring you can use in a .45 and still have 100% reliabilty? I just bought a new SA TRP and the trigger is nice, but comes in at 5.5lbs. I would like to get it down to ~3-lbs. I know that I can monkey with the sear spring, but the Main-spring has to be part as well. I am hoping a drop to 17-18lbs will allow reliabilty and a slightly decreased weight as well. What about a titanium cap, and strut? Will that help with weight, or just lock time and "cool-factor"?

A lot depends on the load you use. A friend shoots steel challenge using a Colt NM in 45ACP loaded with 3.5 gr. YTrail Boss and a 230 gr. lead bullet - you can almost see the bullet bgoing downrange. He uses a 10 lb. recoil spring for reliable function.

[warpspeed]

I have run a 17# MS with a XL firing pin and have never worried about the gun not going bang.