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What type of 45 caliber is this AR? — 1 Answer

by jerrybob, from KS, United States Asked on January 30, 2022

Name FM Products FM-45 AR .45 Rear Charging Upper Reciever, 5 inch w/ Blast Diffuser (4.5)
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Answered by Ethan, Gear Expert, from IL, United States, on March 14, 2022

The FM Products FM-45 AR .45 Rear Charging Upper Receiver is chambered in .45 ACP. This upper features
Non-reciprocating fixed forward charging handle
Left or right side charging
716” 4150 chrome moly barrel
6.75” monolithic free float handguard
M-LOK attachment points
Continuous picatinny top rail
.45 ACP bolt carrier group included
FM products muzzle brake with 5/8x24” threads
Compatible with Glock magazines

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