Quoted: Im getting my Beta-Mag for my AR-15 and my SW-5 in soon. How many rounds max should I shoot/load through/on the C-Mag on the AR-15 without overheating, cooking off, or losing accuracy because of overheating?
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Cook off can occur in as little as 180rds with the 14.5" M4 barrel under full-auto fire. The 11.5" number will be less than that because it has less mass and will heat up quicker (assuming the same diameter).
The maximum sustained rate of fire for the AR (the rate you can continue to fire your AR for an indefinite period of time) is 12-15rpm.
The hotter you get your AR, the more you will contribute to throat erosion and loss of accuracy over time; but you can still be plenty rough with a chrome-lined AR barrel and not see serious throat erosion for some time.
In testing to destruction, both the 14.5" barrel and 20" barrel were able to go past 400 rounds. Handguard temperatures hit the 300F mark and barrel temperatures hit the 1500-1700F mark at time of bursting, so you will probably let go of the rifle long before you shoot a barrel to destruction.
How can I tell when I need to stop shooting other than when the gun is smoking? Should I stop before I get to that point. Isn't that just oil burning off?
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White smoke is the CLP cooking off and is no big deal. Even semi-auto shooters see that... black smoke from the handguards area is the glue that holds the heat shields catching fire. You should probably stop if you see that happen.