I have a JD upper And lower, butt stock, buffer tube, & spring and a lower parts kit. I have some questions about ordering from Brownell's. Is a forward assist button for a 223 the same for a 308 ? Does the 308 dust cover come in a kit or does it come in 4 pieces ? I'm starting with the less expensive items for now putting off the pricey items for later. So far you all have been very helpful. Maybe I well be able to help the rookies when I become the old veteran on the block.