Finally disassembled striker after 20,000 rounds (M&P 40 Pro 5")

[bob98366]

While I've always cleaned the striker mechanism with aerosol brake cleaner (gun cleaner clone), just for fun I thought after 20,000 rounds it might be time to actually take it out and see how it looked. Short version is not bad at all. A bit of black but not enough to hinder operation. The spring is still very stiff. Cleaned it up and reassembled. Will wait until 40,000 rounds to do again.

So I'll continue to squirt brake cleaner down the firing pin hole, work the striker half a dozen times, and re-squirt.

As a data point, the only repair needed on this pistol was a replacement of the slide stop by S&W for no cost to me at 15,000 rounds. All springs are still functional as when new and the bore shows no wear. Free hand I normally shoot 3" groups at 30 feet with it. Most weeks I fire 200 rounds through it for practice. Very pleased with the pistol as a protection weapon and with S&W.

 

[Bob O]

I remove the assembly and clean probably every 500 rounds. Good to hear your pistol is doing so well!

Sent from my XT1060 using Tapatalk

 

[PAFMAN3]

I would not use Brake cleaner, it can soften and melt plastic. A better choice is CRC Mass Air Flow Sensor cleaner , it is plastic safe.

 

[Muss Muggins]

I would not use Brake cleaner, it can soften and melt plastic. A better choice is CRC Mass Air Flow Sensor cleaner , it is plastic safe.

Sounds to me like that's probably not the case. And this thread really doesn't do much for the fellas who replace their RSA's, magazine springs, and other parts after every range session . . .

 

[bob98366]

I would not use Brake cleaner, it can soften and melt plastic. A better choice is CRC Mass Air Flow Sensor cleaner , it is plastic safe.

If you read the contents of gun scrubber, etc. it's the same as non-chlorinated brake cleaner, ~$3 per can at your favorite big box store. Have used it weekly for 3 years on half a dozen polymer firearms with no issues. It does remove the glue used on stick on grips, however.

 

[Woff]

So you have not replaced the recoil assembly? Interesting.

 

[PAFMAN3]

If you read the contents of gun scrubber, etc. it's the same as non-chlorinated brake cleaner, ~$3 per can at your favorite big box store. Have used it weekly for 3 years on half a dozen polymer firearms with no issues. It does remove the glue used on stick on grips, however.

I have been in the automotive repair industry for 40+ years and used a extensive amount of various brands of brake cleaners.
The label on non-chlorinated brake cleaner states "Safe on most automotive plastics"/Extremely Flammable .

MAF sensor label states "Plastic safe, leaves no residue"

I'll spend the additional money on the CRC MAF sensor cleaner.

 

[ffr1910]

You know, they make polymer safe gun scrubber products. Sell the them on the interwebs from what I hear tell. bill

 

[bob98366]

So you have not replaced the recoil assembly? Interesting.

No. Test fired 50 rounds of a new-to-me round today with zero issues.

 

[Steve912]

The label on non-chlorinated brake cleaner states "Safe on most automotive plastics"/Extremely Flammable .

MAF sensor label states "Plastic safe, leaves no residue"

I'll spend the additional money on the CRC MAF sensor cleaner.

They're both very flammable, but they are definitely different.

SDS says CRC MAF cleaner is 80-90% naptha. The CRC Brakeleen shows 40-50% acetone, 10-20% methanol and 5-10% toluene.

 

[PAFMAN3]

They're both very flammable, but they are definitely different.

SDS says CRC MAF cleaner is 80-90% naptha. The CRC Brakeleen shows 40-50% acetone, 10-20% methanol and 5-10% toluene.

Correct...