KREBS Replacement front sight block,

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I am working up the numbers and I wants for a SAIGA conversion on my 223,

 

here is the plan so far,

 

SAIGA 223 20" barrel,

Cut the barrel at 18 or so inches, Replace the gas block with a block/sight combo, like the 100 series AK's,

 

Anyway I havent found a picture of one on a rifle yet, but am real interested in anyones input if you have this Item!