If I form 1 my SP89 and make it a SBR I know I can add the "K" forward grip with the folding buttstock.. But can you keep the "K" grip on if you take the folding stock off the SBR and put back on the A1 buttplate? If you did this would also have to have a AOW stamp or does the SBR stamp cover both?
Don't mean to cause a debate, just hope there is a clear answer to this. Knowing how the verbage is written with the ATF, it probably won't be a clear answer.