M4 Carbine issues

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For a while there m4s were breaking extractors regularly, but I believe they have helped fix this by beefing up the relevant parts/changing spring rates/etc. Just keep in mind that a good m4 is not just an m16 that has been cut down. They re-engineered parts because of what they are talking about there.
 
May want to check a thread on tacticalforums.com called "AR Deficiencies". Lots of knowledgable people chime in on all manner of AR's.
 
All carbine length gas systems, not just the M4, will run at higher pressures. This may or may not affect functioning in a particular carbine depending on all kinds of factors.

There are any number of gadgets designed to reduce the cyclic rate or gas pressure in a carbine length gas system. Most of them are unneccessary in your normal 16" semi-auto carbine, though a heavy-duty extractor spring or O-ring extractor insert can provide some cheap insurance.

Problems with the carbine length gas systems are more apparent in full-auto or suppressed guns (or guns with both) than they are in semi-auto 16" guns.
 
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