My Battalion (light infantry), has both the M26 and the M500. We use the M26 in the stand alone configuration, not mounted underneath the M4, as a breaching shotgun.
The M500 is one of the worst systems to be fielded, in my opinion. First, we don't need an offensive shotgun with 18.5" thin barrel with no stand off device and a full stock. When configured with the pistol grip stock, we have an overly long weapon for breaching. If we had purchased the 590s with thicker barrel, that would be one thing.
I saw several M500 with burst barrels because of poor technique and thin barrels. Soldiers would jam the muzzle into practice doors made of soft wood and plug the barrel. A standoff muzzle device would have minimized that possibility. The M26 isn't perfect, but its better than the M500.
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