Quick message to resurrect this thread back to life for those interested 🤪
Had some parts delivered today from Impulse101 for my GDR15 CQB - not seen anyone else speak of these parts anywhere, so here goes...
https://impulse101.jp/en/search?controller=search&orderby=position&orderway=desc&search_query=GBLS+DCI&submit_search=
DCI Guns light trigger spring, DCI Guns main spring spacers (x5 in the pack) a DCI Guns QR Bolt Carrier End. This last part is fantastic as it saves loads of time.
I have all four GBLS main springs for mine (90, 100, 110 & 120) however the weakest M90 is the only one realistically playable for the sites I go to.
That being said, the M90 is a little anaemic and the next one up, the M100, a little on the spicy side.
Spacers are very well made. Cannot fault any of them.
- One spacer on the M90 with .25 gets yields a thirty shot average of 289.9FPS (0.98J) and 3FPS spread 👍
- Three spacers on the M90 with .36 yields a thirty shot average of 260.6FPS (1.14J) and 4FPS spread 👍
(275mm PDI 6.01mm barrel is in there too)
The QR Bolt Carrier End, made up of three pieces, is superb and made with very tight tolerances.
Rock solid when locked in place and takes away the need for a heat gun to melt Loctite 480 on those two little screws every time the spring or whatever needs accessing. Then no need for more glue after.
Totally brilliant now I'm pulling the BCG to bits loads more experimenting with different number of spacer/BB weight/main spring combos.
QR Bolt Carrier End...
One spacer in there...
Rest of the spacers...
Light trigger spring. Will fit this another time...
My GDR15 CQB is one of the more recent ones (2022 updated version) so, at least on the M90 main spring, trigger pull is not too bad.
This will still lighten the first stage pull weight slightly - but obvs not the break.
Overall, things are improved - which is rare with this platform!