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I have a sterns defense upper and conversion mag block.. will this work for me? In a SB tactical HBPDW brace? Or a maxim PDW brace? — 1 Answer

by Jon Rambo, from MN, United States Asked on September 28, 2025

Name Blitzkrieg Components AR 9 mm Recoil Buffer (4.9)
$164.99 $159.99 Save $5.00
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Answered by Blitzkrieg Components, Manufacturer from FL, United States, on October 02, 2025

It would work fine with your upper, but the buffer is too long for your HBPDW brace. The buffer tubes for PDW braces and stocks are very short and require a short buffer to fit and operate. This buffer requires a standard carbine buffer tube (7" inside length) to operate properly. For the PDW stocks use the Kynshot RB5004 2.5" .308 buffer and a Sprinco .308 carbine buffer spring (Orange). The RB5004 buffer is lighter than optimal for 9mm but will function with short barrels (5.5" or less) and still give a better feel than a conventional buffer.

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