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I have a Sig Sauer MCX Spear LT chambered in 300 blackout with a 9” barrel. Can I use my current lower to attach this upper to? Any mods needed? — 2 Answers

by RobbieSF, from FL, United States Asked on November 6, 2024

Name SIG SAUER MCX-Spear LT 11.5in M4/AR Conversion Kit
$1,999.99 $1,909.00 Save $90.99
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Answered by RobbieSF, member, from FL, United States, on February 13, 2025

You sure can. I have a 300 blackout with a 9 inch barrel as well and I frequently swap the 5.56 in 11.5 inches regularly.

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Answered by RobbieSF, member, from FL, United States, on January 17, 2025

You sure can.

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