SR-25 Project

[Unknown1]

Hi guys and girls

Been looking around the forum for awhile now and have really enjoyed looking at the various projects members have been posting about so thought i'd write my own and share my project and a bit of help if anyone wants to share, anyway here it goes.

So to start this build I purchased an A&K SR-25 body from a member here, this came with a gearbox casing and selector plate. The body seems to be decent quality and fits well for this project. The main problem facing this is that the body came without body pins, fire selector etc. So I have gotten a quote from G&G to sort out body pins as M4/M16 aren't long enough.

I ordered various parts from Asia yesterday so I expect they'll arrive here in a week or two. The Parts ordered are:

LaRue 13.2" RIS
G&P 120rd Magazine
G&G nano-tech piston (very hard to source)
G&P Piston head
SHS Cylinder
G&P cylinder head
SHS high speed gears
6mm Prometheus bearings
Classic Army tappet plate
SHS switch assembly
SHS gearbox spring set
Vortex bearing spring guide
5KU SR-25 air nozzle

The A&K version uses a version 2.5 gearbox, basically an elongated version 2. This means a proprietary Piston, Cylinder, Sector gear, Tappet plate and nozzle are needed. The rest are version 2. I am unsure about the spring- I believe a PSG style spring is needed but I am unsure, if a member here could confirm I'd be very grateful.

The body has the gun locked to semi already which I intend to keep as I prefer semi personally- I will be using an M90 spring to achieve just under 328fps with a .2g BB. This is due to a 1J law here in Dublin. I also have used high speed gears and want to keep this a high speed set up as I like a fast, crisp trigger response- This is a preference and not at all a necessity.

Parts I will need to order over the coming weeks include:
M90 spring- still unsure if standard or not
G&P M120 motor
Set of gearbox screws
6" barrel extension or a 16" barrel
Scar style flash hider with QD mock suppresor
Gas block- haven't decided which yet
Harris style bipod
Body parts from G&G

I already have a few spare parts I will be using, such as MOE pistol grip, CTR stock, stubby foregrip etc
I also have not decided on my optic set-up. I was considering an Aimoint comp2 style with a 3x magnifier or running with a Leupold style scope- opinions appreciated.

I will update with pictures as this progresses, If you have any questions or opinions please feel free to share.
Cheers,
J.

[Unknown1]

Re: SR-25 Project

Nearly forgot about this thread, at this stage the project is about 80% done so i'll fill in what's happened so far.
The process of the build has proved expensive so progress has been slow however the gearbox is now completed, working with the V2.5 gearbox I have used:

A&K Shell
Prometheus 7mm bearings
Vortex metal bearing spring guide
SHS M90 spring (due to fps limits here)
G&G Nano tech piston
VFC piston head
SHS Cylinder
5KU double air seal cylinder head
5KU Air nozzle
Classic army tappet plate
SHS SR-25 gearset
Element steel trigger
Element Switch assembly
High quality wiring
Load of SHS parts for springs, screws etc

I'm waiting on my G&P M120 motor in the post now but had a test fire with a borrowed motor and the trigger response is exactly as I wanted it, quick snappy and ready for a follow up shot.

The hop-up assembly is a G&P chamber with a guarder clear rubber and nub but I haven't bought the barrel yet, I've been considering the Madbull range for price and generally they have proved well for me in the past. If anybody has any suggestions or comments on the barrel I'd appreciate it.

From the internals I've expected the best with the prices I've been paying and from inspection and comparison to previous work I've done one thing I have to add is the quality of the SHS gearset, really a strong tidy looking gearset at a pretty decent price too. I'll comment on the externals next week when the last few parts should be here.
Anyway, cheers for reading and if you have any questions let me know.
J.