In order to support a tube product, with the exception to Shindo, manufacturers need a large inventory of tubes. Also manufacturers expect MAJORITY of owners to roll so don't use rare NOS for stock.
One of the reasons later Sig MKIIa has a 8416 / 6922 switch is to allow more rolling options. You have no idea the abilities of your Ren Mk III with stock tubes.
One of the reasons later Sig MKIIa has a 8416 / 6922 switch is to allow more rolling options. You have no idea the abilities of your Ren Mk III with stock tubes.