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JP silent captured springs
Does anyone know what this means?
http://www.jprifles.com/1.4.7.2_os.php :
"The JPSCS is not compatible with any 9mm AR variant or any blowback system using a solid (weighted) carrier."
I don't know what a solid/weighted carrier is? Thanks in advance.
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Rifles: Custom AR-15, Tavor, Arsenal SGL 31-68
Handguns: Colt Python, XD(M) 4.5" .40, Glock 19, M&P 9mm, Walther PPQ 9mm, FN FNS-9, HK P30S 9mm, Walther PPS 9mm, Browning Buck Mark
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