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First off I'd like to attribute this information to bobgengeskahn, Ronin055, and the many other helpful people on here and on airsoftforum.com. None of this is my own work; I just happen to have read about the Echo 1 ASR for 30 hours so far this week.
What I found is the lack of an "all you can eat" collection of information for this rifle. My goal is to provide that. Moderators, please feel free to edit this post.
ECHO 1 ASR - http://www.airsoftgi.com/product_info.php?cPath=139_113&products_id=6572 - $100-115 USD
About the base rifle:
The Echo 1 ASR is a rebrand of the WELL MB06. On the lower end of the price range for sniper rifle platforms, it is generally accepted that upgrades are required to field this weapon in a war. This is also one of the few bolt action sniper rifles (BASR) that can be easily modified to a left-handed rifle.
Are there common issues?:
The number one reported issue is a loose stock. This can be corrected by disassembling the receiver and tightening the stock from the inside.
What parts should I upgrade?:
Here is a list of upgrade parts, based on a mash-up of bob's, Ronin's, and various posts I have found. I'm adding in 'options' so you can play with your price range. When it comes to quality though, you get what you pay for.
Compatibility explained by bob:
"Cylinder, trigger, piston, spring, guide etc. are APS2. Hop up, barrel, spacers, outer barrel threads are L96."
What I found is the lack of an "all you can eat" collection of information for this rifle. My goal is to provide that. Moderators, please feel free to edit this post.

ECHO 1 ASR - http://www.airsoftgi.com/product_info.php?cPath=139_113&products_id=6572 - $100-115 USD
About the base rifle:
The Echo 1 ASR is a rebrand of the WELL MB06. On the lower end of the price range for sniper rifle platforms, it is generally accepted that upgrades are required to field this weapon in a war. This is also one of the few bolt action sniper rifles (BASR) that can be easily modified to a left-handed rifle.
Are there common issues?:
The number one reported issue is a loose stock. This can be corrected by disassembling the receiver and tightening the stock from the inside.
What parts should I upgrade?:
Here is a list of upgrade parts, based on a mash-up of bob's, Ronin's, and various posts I have found. I'm adding in 'options' so you can play with your price range. When it comes to quality though, you get what you pay for.
Compatibility explained by bob:
"Cylinder, trigger, piston, spring, guide etc. are APS2. Hop up, barrel, spacers, outer barrel threads are L96."
What DIY upgrades should I perform?:Upgrade Kits: $33-
Inner Barrel: $35-74Echo 1 - This kit comes with "an upgraded metal spring guide, upgraded metal piston, an upgraded spring, and a torque absorbing bearing set." - $33
http://www.airsoftatlanta.com/ECHO_1_ASR_Spring_Rifle_Upgrade_Kit_p/12201.htm
Angel Custom Advanced Precision Airsoft APS / APS2 / Type 96 / M99 500 FPS SP150 Tune Up Kit - $48
Includes Carbon Steel SP150 high power irregular pitch power-up spring, 100% T6 Aluminum High Performance Piston, 100% T6 Aluminum High Performance Spring Guide with guide rod.
http://www.evike.com/product_info.php?cPath=648_656&products_id=35641
What to look for? Steel and brass are superior materials than aluminum.
Barrel Spacers: $18-20Prometheus 455mm / 6.03mm EG Tight Bore Barrel for Airsoft AEG (AK47, AK47S Length) - $74
http://www.evike.com/product_info.php?cPath=24_72_378&products_id=24387
New Version Mad Bull Airsoft Black Python 6.03mm tight Bore Inner AEG Barrel. (455mm) - $30
http://www.evike.com/product_info.php?cPath=24_72_375&products_id=24374
LONGER BARRELS, REQUIRE SILENCER/BARREL EXTENSION
MadBull Ver. 2 Precision Inner Barrel for M16 (509mm) - $35
http://www.airsoftgi.com/product_info.php?products_id=1231
Why nothing longer?
vindi says: "It has long been accepted in the spring powered bolt action world that anything over 509mm is pointless and actually causes the rifle to be less accurate"
You can also make your own if you are on a budget.
Hop Up Chamber: $85Laylax PSS96 barrel spacer - $20
http://www.airsoftextreme.com/store/index.php?main_page=product_info&cPath=443_460&products_id=1325
Modify L96 Barrel Spacer Set - $18
http://www.precisionairsoft.com/Modify-L96-Barrel-Spacer-Set-p/mod040.htm
Hop Up Bucking: $5-16PDI Hop-Up Unit for Maruzen Type 96 Airsoft Sniper Rifle UTG L96 - $85
http://www.airsoftoutletnw.com/index.php?page=shop.product_details&category_id=86&flypage=flypage-ask.tpl&product_id=3749&option=com_virtuemart&Itemid=28
Spring: $15-20Guarder improved hop bucking (Hard) - $5
http://www.airsoftextreme.com/store/index.php?main_page=product_info&cPath=443_444_450&products_id=1188
Firefly Hop Bucking - Hard - $16
http://www.airsoftextreme.com/store/index.php?main_page=product_info&cPath=443_444_450&products_id=3825&zenid=u6sq1pmka2o108adeaaulpe6j3
Scope: $45-70Angel Custom PSS2 Mega-Up APS / Type96 Power Up Spring - SP150 (420~520 FPS) - $15
http://www.evike.com/product_info.php?cPath=648_656&products_id=35660
FF PSS2 M150 (thick type) - $18
http://www.airsoftextreme.com/store/index.php?main_page=product_info&cPath=443_465_467&products_id=1396
Angel Custom PSS2 Mega-Up APS / Type96 Power Up Spring - SP170 (480~550 FPS) - $15
http://www.evike.com/product_info.php?cPath=648_656&products_id=35661
FF PSS2 M170 (thick type) - $20
http://www.airsoftextreme.com/store/index.php?main_page=product_info&cPath=443_465_467&products_id=1397
Why nothing more powerful (>170)?:
bobgengeskahn says: "I would also recommend that people NOT put anything over a M150 or M170 spring. I have a M210 in mine and have successfully torqued/bent my bolt handle."
Silencer/Barrel Extension: $23-60 (OPTIONAL)Tactical 3-9x40 Rubber Scope (Ruby Lens) W/ Scope Ring Set by NC Star / AIM - $45
http://www.evike.com/product_info.php?products_id=28108
Leapers 5th Gen 3-9x50 AO Mil-Dot Rifle Scope with R/G Reticle, 1" Tube - $70
http://www.pyramydair.com/s/a/Leapers_5th_Gen_3_9x50_AO_Mil_Dot_Rifle_Scope_with_R_G_Reticle_1_Tube/658
ELEMENT silencer "NATO" engraved 14mm +/- - $23
http://www.weaponblender.com/index.php?productID=839
Echo1 M28 Type Airsoft Force Recon Barrel Extension - (14mm Negative / Covers up 180mm of outer barrel) - $55
http://www.evike.com/product_info.php?cPath=25_101_273&products_id=36004
Madbull Gemtech Quick Detatch Mock Supressor Barrel Extension w/ QD Flashhider. (Black) - $60
http://www.evike.com/product_info.php?cPath=25_101_273&products_id=29763
In general, I know there is more that I don't know than I do know, and I welcome any corrections, comments, or additions.Should I "swiss-cheese" my piston?
Teflon Tape Seal Improvement:vindicareassassin replies: "For all those of you who are thinkin 'Oh, I'll Swiss cheese my piston as it will be lighter and spring forward easier', stop it! Leave such mods to the go faster full auto queens, for a DMR it is a good thing to have the extra weight. You will need the extra weight in the piston to help to shift the heavy weight BBs you should be using, as nothing gets things moving like a heavy object with some inertia behind it. "
Make your own Fishbone Hop Up Nub:
http://www.filakairsoft.net/index.php?showtopic=733
Polish your new barrel:
http://www.airsoftsniperforum.com/phpBB/phpBB3/viewtopic.php?t=1463