03-20-2012, 09:57 PM
Join Date: Aug 2005
My Ride: F30 328i M Sport
| Return springs vary by manufacturer. Most should be user-serviceable. The problem with GP systems is that everything is proprietary, so there is no commonality in parts or construction. Many things are similar, but never the same between manufacturers. In order to get the replacement parts, you need to go back to the original manufacturer. In the case of the Adams, it looks like it's one whole $99 assembly for everything. If that is the case, it's likely a whole unit that would have to be replaced. I'm not seeing any specific spring on the website, but there are lots of companies where you have to call them directly to get the specific part you want.
Either way, if you plan on having the rifle for a while, I'd recommend picking up an extra set of replacement parts.
For what you are going to use your rifle for, you are fine with what you have. If you were going to be using your rifle for heavy service use, I'd say that you'd need a more purpose-built system like an HK, POF or LWRC, but where you're at, you're fine.
As for carrier-tilt, it will always be present in any piston-driven AR. Having a solid one-piece carrier/key assembly is important, but not a cure-all. As long as you have an op-rod pushing on the top of a bolt carrier, and the carrier is not operating on a track or rail system (like in a SCAR, ACR or AK), you will be susceptible to carrier tilt.
There are two ways to mitigate the issue in the long-run.
HeavyBuffers Anti-Tilt buffer:
PWS Enhanced buffer tube: