What to replace after 5k, 10k, 15k, 20k rds

[FishingFool]

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[M4Fundi]

Go to SEARCH and plug in key words MAINTENANCE and hit the In Titles Only button and you will get all you want and more.

[FishingFool]

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[ForTehNguyen]

After examining my receipts I've realized that I'm pretty close to the 5k rd mark on my bcm middy. If my plans hold true I should be able to reach 20k rounds within two years between carbine courses and practice. At which point should I start replacing stuff to keep things running in good order?

there was a tactical course where they loaned out a BCM middy for out of state students, they ran 26k rounds without cleaning. At 16k rounds they replaced the bolt after a lug cracked, 26k replaced bolt again and cleaned after some FTE

Obviously this type of torture test isn't recommended for normal use but just giving an idea of how far it could go. Of course keep spare parts on hand just in case is the big thing.

https://www.m4carbine.net/showthread.php?t=44790


"Filthy #14 is the most used, and has (as 12-24-09) 28905 rounds down range. The barrel is original. It has never had a brush put through it.

-At 16,400 rounds bolt lug cracked. Replaced the bolt carrier group

-At approximately 26,000 rounds fired a 5 shot 50m group that went into 0.5". This might not be that tight at 100 meters.

-At 26,450 rds had 3 failures to extract. Replaced BCG and cleaned gun for the first time

We use only SLip2000 EWL for lube and Slip 2000 725 to clean.

**All of the rounds were fired during class (at the rate of approximately 1,250 rounds every 3 days)**

I do not recommend allowing the gun to go this long without PM (preventive maintenance). However, we wanted to see how far we could take this particular gun (#14) without being burdened by the myth of meticulous cleaning."

[M4Fundi]

I know IraqiGunz (armorer & Mod) has dealt with this as have others. You will get more info on the search than on this thread b/c it has been dealt with and is a bit controversial;)