Fully collapsed its about the same length as a mil spec buffer tube - Strike Industries PDW Stock

As the title suggests, when fully collapsed the stock saves you may be an inch compared to normal buffer tube; with the trade off of the price, weight, multiple stock positions and stock comfort that you would get from a mil spec option. If you have a specific SBR build in mind, by all means it works and it has a strike spring out of the box that runs great with mil spec BCG’s (will not cycle lightweight BCG’s properly without an adjustable gas block) but for the price I would recommend going for something a bit more compact and versatile