It looks like the handguard retaining ring is missing. The only way to get one onto the barrel intact is to remove the front sight base which may or may not involve a some type of press and a bit of profanity. I've had the pleasure of doing this twice and if I had to do it again I think I'd just snip the bottom of the ring and weld or braze it back together once it was coaxed over the barrel.Information
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