interested in purchasing this block as a back up, seller ad says there Darton bored to 83mm. looking at the pictures it seems to be an iron lining with aluminum outer, with an obvious block guard.looking around im thinking they might be the open deck no flange replacement type sleeves but im not to sure.
http://i1238.photobucket.com/albums/...119_161920.jpg

 

Looks like factory sleeves with just a block guard to me. Ask the seller to produce the receipt.

 

as Muckman stated, these are not genuine dartons.
absolutely.

 

That's what i was thinking they look pretty thin,but figured they might oem replacements,thanks.

 

Its hard to say if they are Darton 300 series sleeves due t oall the dirt. I would not recommend buying this block. If you look at the left middle cylinder the outside of the stock casting has been broken off possibly when the block guard was installed. If it happened after this could cause the stock casting under it to crack.