Pgp: Centerfire bolts

[cougar20th]

I keep seeing centerfore bolts mentioned for pgp's. What's the difference compared to a 2k pgp speeddemon bolt. And importantly which is better?

[Psycho91]

I think they had a hole in the middle like most bolt for markers, instead of the rim fire bolt

[JeeperCreeper]

The centerfire bolts are a bit longer, so they can cover the port and redirect the air through the center of the bolt. Because they are longer, they have a sliding bolt lug to compensate for the extra length. They are also hard to find (NSD2 was working on a batch of these)

Speed Demon bolts for PGPs only locked in place.

The other option is to use a longer P68 Speed Demon, but then you need a new barrel tube with the feed moved forward.

Centerfire setups are arguably softer on paint.

[JeepDVLZ45]

This guy knows! ☝️

Small side note: They’re also better if you want to run FSRs. The standard PGP bolts tend to damage fins because the air is coming up and not from the back

[JeeperCreeper]

Yeah definitely. If you chamber an FSR into a stock bolt PGP, the fins sit directly over the port, and it blows a chunk out of them.

[JeeperCreeper]

Here's a pic from netsurferdude2 showing the space where the sliding lug sled goes on the centerfire bolts. Everything past the double o-ring setup is extra length thay isn't there on the stock bolt.

[chplnstone]

as others have said, centerline can be easier on brittle paint vs. rimfire, here's a comparison with a general Joe's centerfire on top & cooper-t locking rimfire on the bottom