Blocks & Decoration Metal Grates should allow projectiles to pass through.

Cratar

Terrarian
Not really much to say here other than it seems to make sense and it would work a lot better than hammering a vertical line of blocks into slabs. It would give the player more options to build defensively. Keeping monsters at bay while you pick them off, build portcullises! In adventure maps where building/mining is impossible, it introduces a way to cordon areas off to players who need to fire through and activate triggers.

I'm not all too sure if they should allow just any projectile type, musket balls at the very least, bullets, maybe arrows. Bombs, missiles etc? Maybe not. Perhaps there can be tiers of grates to address this.
 
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