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12/7/2025 1:41:14 PM EDT
Are these chrome-lined barrels? Any idea on the twist rate?

https://aimsurplus.com/products/used-leo-trade-in-windham-weaponry-145in-pw-m4-223556-ar15-complete-upper-receiver-w-quad-rail
12/7/2025 2:22:57 PM EDT
[#1]
chrome lined 1/9 twist
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