You can yes. Sniper and SMG are part of the world loot pool (so random drops and primes - but the pool is large so can be rare) also from Banshee and umbral engrams.

Do seventh Seraph weapons drop in beyond light?

The Seventh Seraph weapons have been added back into the Destiny 2 Beyond Light world loot pool. ... Players could find the Seventh Seraph Carbine randomly elsewhere from an enemy drop or by completing events, but Banshee-44 is the only guaranteed way of unlocking the Auto Rifle.

Where do seventh Seraph weapons drop from?

The most popular roll out there in the community at the moment is 4th times the charm and Rampage. To get this weapon it's a random drop from various activities like strikes, crucible and gambit as well as world activities like Patrols, Public events and engrams.