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And wasn't there a model number on the early A1 that was transforming to an A2 with 1/7 twist and the round handguards? Thought I had a brochure of the this model but can't find. Thx.
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During the transitional period from SP1 to Sporter II, there were some strange combinations. I have seen early Sporter 2s with both Sp1 and C7 type uppers with a 1/7 Pencil barrel that were labeled "Sporter II." I even saw a "Match HBAR" with C7 upper.... Eventually they switched to A2 uppers. There were very few, as I suspect they were using pencil barrel blanks on hand, and switching to 1/7 twist. I was a dealer at the time, and once ordered two "Sporter Lightweights" from a wholesaler. They both had an A1 length stock, with an A2 finish and buttplate, and 1/7 twist 16" Pencil barrels. One, however, have a C7 type receiver and a A1 flash hider, and the other had an A2 upper with a A2 flash hider. The labels on both boxes were identical, except serial number.
As with most martial arms, when production is changed to upgraded parts, the existing stock of older parts is often used up.