Hi Rene and welcome. Unfortunately, Buds does not have an eta. You could purchase separately : budsgunshop.com/product_info.php/products_id/160571/sig+mcx+rattler+lt+.300+black+6.75

most likely but unknown when they will have it and even if they had a eta we would not know it We are not buds employees we are volunteers that answer questions.

Rene, we're just customers as yourself but buds won't give out estimated times of when they'll receive deliveries. They do have a 5.56 NATO version available with brace. Here's a link to one if interested......................... budsgunshop.com/product_info.php/products_id/163385/sig+mcx+rattler+lt+5.56+7.75+black+m-lok+30rd+psb ...................... Or you could purchase the brace separately, if interested here's a link to a 300blk version without the brace....................... budsgunshop.com/product_info.php/products_id/160571/sig+mcx+rattler+lt+.300+black+6.75 ................... Sorry but hope this helps some.