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Not sure what the "valve locker" is...but I'm guessing it's what's called part #66 in an M4 (the part isn't actually numbered in the SCAR).
Also, a detailed description on what/how your rifle is acting is helpful.
How to test that the knocker is working.
1. Remove the magazine
2. Separate the upper from the lower
3. Cock the hammer manually (the knocker should retract from the area in the magwell)
4. Make sure the selector is in semi
5. Pull the trigger, the knocker should be knocked forward
6. Cock the hammer slowly...you should see the knocker retract at a given point when the hammer is moving back.
If it's not doing that, you've got to check that part #66 is installed correctly and that the spring is in place. The legs of the part must ride on the hammer and ride underneath the knocker.
The knocker must have it's spring installed under it..and the tiny little peg that goes in the spring.
The parts should move freely...and not be a tight fit at all. With some of the machined aftermarket parts, you might have to round edges, file, etc...to get it to fit your particular trigger/hammer housing.
You can test all this with the whole trigger unit out of the lower...but becareful that the little spring for part #66 doesn't fly off (piece of tape over it will hold it in position temporarily or just keep your thumb over it).
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