Do you sell M&P Shield 40 cal and trade in my Sig P229 40 cal?

Probably better to call them. They do carry the m&p sheild...

Reed's does carry the M&P Shield .40 cal in stock. They don't do trade in's but they can give you store credit towards your next firearm purchase. Hope that answers your question.

They do carry the M&P shield 40 California model, however they don't purchase used firearms. Your best bet is sell it on calguns or armslist as a private party transfer and then purchase your new pistol at Reed's