The torah forbids creating artifacts used in the beis hamikdash (based on the verse lo taasun iti (Exodus 20:19), see Talmud Avoda Zara 43a, Rambam Beit Habechira 7:10 and Shulchan Aruch YD 141:8). This would seem to include the trumpets, which the gemara elsewhere learns could be made of any material. Therefore, can one create, buy, sell or own these instruments?
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The Minchas Chinuch in Mitzva 254 writes (my own translation):
The trumpets could very well be included in the latter category of utensils that do not have a specific form. Rambam (Kli Hamikdash 3:5) writes that they must be made from silver and ideally out of a single block but places no constraints on the measurements.