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<blockquote data-quote="aestus" data-source="post: 2000714" data-attributes="member: 2989">Shooting 5.56 SBR suppressed and unsuppressed should be no issue. The only thing I can see (and this is a little on the extreme side) is if you&#039;re running a 7.5&quot; barrel with an uber heavy buffer like an H3 AND extra power springs that&#039;s tuned specifically to run really hot 5.56 loads suppressed and then decided to change to uber weak steel cased .223 ammo in the next mag change unsuppressed.&nbsp; Then maybe you may run into issues, but most likely can be corrected in that particular case by using standard springs and using a lighter buffer.Also, shouldn&#039;t really need a switchblock if tuned properly to cycle everything from hot 5.56 to weaker .223 steel cased. Sure it might mean your hotter 5.56 loads may &quot;eject wrong&quot; or pound you a little harder, but I would rather have a rifle that works than a rifle I constantly have to break out the tools and spend money to &quot;tune.&quot;&nbsp; If you got loads of 5.56 brass that you don&#039;t want to turn into 300 blk, then a 5.56 sbr may be a better solution for you.&nbsp; Typically 10.5&quot; aren&#039;t as finicky. 11.5&quot; usually just works with little no tuning needed.The 300 blk sbr I&#039;m building is mainly going to serve as short range brush gun hunting / HD / fun gun.&nbsp; I won&#039;t be shooting carbine courses with it so having cheap bulk ammo by the thousands is not an issue for me for the 300 blk SBR I&#039;m building.</blockquote>

[QUOTE="aestus, post: 2000714, member: 2989"] Shooting 5.56 SBR suppressed and unsuppressed should be no issue. The only thing I can see (and this is a little on the extreme side) is if you're running a 7.5" barrel with an uber heavy buffer like an H3 AND extra power springs that's tuned specifically to run really hot 5.56 loads suppressed and then decided to change to uber weak steel cased .223 ammo in the next mag change unsuppressed. Then maybe you may run into issues, but most likely can be corrected in that particular case by using standard springs and using a lighter buffer. Also, shouldn't really need a switchblock if tuned properly to cycle everything from hot 5.56 to weaker .223 steel cased. Sure it might mean your hotter 5.56 loads may "eject wrong" or pound you a little harder, but I would rather have a rifle that works than a rifle I constantly have to break out the tools and spend money to "tune." If you got loads of 5.56 brass that you don't want to turn into 300 blk, then a 5.56 sbr may be a better solution for you. Typically 10.5" aren't as finicky. 11.5" usually just works with little no tuning needed. The 300 blk sbr I'm building is mainly going to serve as short range brush gun hunting / HD / fun gun. I won't be shooting carbine courses with it so having cheap bulk ammo by the thousands is not an issue for me for the 300 blk SBR I'm building. [/QUOTE]

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