They will also take used barrels as trade towards new. If you pick up a used one, check their website to see what type of grip you have. The trigger mechanism is encased in the stock and early models have a non-adjustable trigger while the newer ones are adjustable. If you have the non-adj they will upgrade it for you free. While your there check out the huge list of available cal.
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Contender
G2
Encore
Striker
Coompetitor