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Posted: 9/15/2012 7:03:31 PM EDT
| Assuming high quality parts (BCM, JP Enterprises, etc) what is the approximate replacement schedule of parts like Bolt, bolt carrier, trigger group, barrel, upper, etc; based on round count? |
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Quoted:
Assuming high quality parts (BCM, JP Enterprises, etc) what is the approximate replacement schedule of parts like Bolt, bolt carrier, trigger group, barrel, upper, etc; based on round count? A bolt carrier should last indefinitely, unless the gas key screws loosen or break. A trigger group will also last a long, long time. An upper should last a lifetime––look at how many A1 and A2 GI surplus receivers are still in use. I replace gas rings when they will no longer support the bolt carrier. (Pull the bolt out as far as it will go and stand the BCG up on a counter or table so that the weight bears on the bolt face.) I'll replace the extractor as soon as I have the first extraction or ejection issue. (It hasn't been a problem in approximately 3,000 rounds.) I'll make sure I have a spare bolt handy when the current bolt reaches 5,000 rounds. (I actually already have a spare bolt, but I will start watching things more closely then.) I also have spare cam pins, firing pins, springs, etc., as you really never know when something might break. As for barrel life, I'll replace it when there's a noticeable change in accuracy. I expect I'll get at least 10,000 rounds out of the current chrome-lined barrel––if I can ever afford to shoot that much in any particular rifle. Bottom line, have a spare bolt and a few other small parts, and don't sweat it. 
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Quoted:
Assuming high quality parts (BCM, JP Enterprises, etc) what is the approximate replacement schedule of parts like Bolt, bolt carrier, trigger group, barrel, upper, etc; based on round count? Are you taking this firearm to war with you? If not then replace the parts as they wear out or break. No point in replacing parts that still have some life left in them just because someone on the internet told you to replace at some arbitrary number. |
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Every firearm is different.
Way too many variables to put a definitive answer on it. What lube, ammo, cleaning schedule, environment, firing schedule, rates of fire, and RPM by day/week/month? Better to just have spare parts (rifle) on hand just in case, then to replace a part that may go another 10,000 rounds. |
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I found this years ago, but must admit that I don't follow it.
per Jeff Gonzales: Here is our PMS for the M4: 2,500 round interval Inspect and replace as necessary extractor spring, insert and O-ring 5,000 round interval Replace extractor spring Replace extractor insert Replace extractor Replace Crane O-ring Replace gas rings Replace action spring 10,000 round interval Replace bolt Replace lower receiver parts 15,000 round interval Replace barrel Personally, I use CS springs, and at 10K rounds the rifle becomes a range gun, and I replace parts as they break. |
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