Left Hand 6.5 Grendel Project

[jedagi]

I'm in the process of accumulating parts for my LH 6.5 Grendel build. It's going to be rifle length not carbine. Intended use will be a hunting rifle for longer ranges. So far all I have are a CMT billit left hand stripped upper, An Anderson forged stripped lower, a stag arms left hand bolt carrier and an ambi safety. 
Future parts are as follows. An underground tactical left hand bolt, a BHW 20" barrel standard or light profile with rifle length gas port, a diamondhead VRS-T hand guard 15", a drop in trigger, single stage 3#( haven't decided which brand ). Also an ergo grip and A5 buffer tube Assembly. I haven't decided on a stock , scope or scope mount yet. 
 I have lots of questions. BHW only makes the type 1 chamber. I've read many posts that say the .136 bolt face depth is better due to the thicker extractor lip/claw. Underground tactical make both type 1 and 2 bolts. If I get the barrel and extension in type 1 from BHW, and the type 1 left hand bolt from underground tactical, will the headspace be correct or will I need to buy/rent a set of go no go gauges? Will the bolt work properly in the BHW barrel extension, being that the bolt is left handed? I read something about chamfers on the lugs in the barrel extension. 
Also I read where Bill Alexander says that in barrels 20" and longer that the 1-9 twist is better. 
These are my first few questions. If anyone who really knows, has some good advice, please reply. 
I'm sure I'll have more questions in the future. 
Thanks
Jeff

[GLSHOOTER]

Th barrel will be fine with your LH set up. My two seem to run pretty well..LOL As for the extractor being better that is pure unadulterated BS. Nothing from an engineering standpoint can support that theory including drawings on the back of an envelope are bandied about.

No need for gauges.It will be good when you get it. Twist rate is based around velocity and bullet LENGTH. I would do a nine but nothing would preclude you from using an eight.

Greg

[jedagi]

Thanks for the reply. I'm about to order a 20" standard profile stainless finish. I hope it gets here before next deer season.
I've got upper and lower, BCG and ambi safety. Got to get LPK, trigger, stock and hand guard. Can't decide on fixed rifle stock or adjustable. 
Thinking about a primary arms 4x14x44 ACSS FFP Orion scope. 

[RockNRollMullet]

You should look at Velocity triggers you can get one at WCArmory.com or WCA's eBay listings with free guntech anti rotation pins for around $130

Info on Velocity Triggers:
Velocity Triggers is based in Phoenix, AZ. Tom Vehr, owner and operator, has over 30 years of experience designing, manufacturing, and assembling triggers.
Tom spent 14 years at Timney Triggers running all aspects of production including design, set-up, tooling, testing, and scheduling.
In 1995 Knight Rifles hired Tom to direct their trigger manufacturing. Over the course of 13 years at Knight Rifles, Tom produced close to 500,000 trigger assemblies as well as other parts.
In 2008 Tom started Vehr Manufacturing, parent company to Velocity Triggers. Vehr Manufacturing continues to produce triggers for Knight Rifles along with doing other job shop work.
About the Velocity AR Trigger
Finally!!! A high quality precision engineered AR trigger at an affordable price.