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The Reising sling has a longer loop and solid brass ends that are painted black. the weave of the sling is different also. Here is a comparison pic of the Reising sling and an early M1 Carbine sling....

H&R Reising USMC WWII Trainer from my collection pictured with Several magazines including two military mags in the wrap and a professionally done
joining of two mags to create a 20 round mag.
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