It is the EO 512 that I got last year. No issues as it is a rugged little piece of engineering. Only gripe I might have is that I wish that the battery life of the AA's would be a little better as they need to be replaced every 6 months of or so of use casual range use.
Rails are the old HALO rails I managed to score before he stopped making them. Now I would definitly recommend the Chaos rails that are being sold albiet they are a little pricey.
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