Before you buy any Lee-Enfield, from anywhere, at any price, get written proof of good headspace. It'd be even better to have the retailer prove it with a No-Go guage. A Field will do. If the bolt closes on a No-Go, try the Field. If it closes on the Field, the headspace is bad.
Fixing bad headspace is an expensive nuisance. Bolt heads run $11.30 each from Gunparts for a No. 4. No. 4 bolt heads are numbered but going up by one number is no guarantee that that will fix bad headspace. Guages only. (If it's a No. 4, the rear sight will be on the receiver. What model matters. They're not the same.) There are 4 numbers on a No. 4 bolt head. 0 to 3. Gunparts has 0's and 1's. Finding a 2 or 3 isn't easy.
If it's a No. 1 and the headspace is bad, it's a very expensive nuisance. The bolt heads are not numbered and the only way to fix it is with guages and a handful of bolt heads at $11.30 each from Gunparts. You try the bolts heads with the guages until you find one that doesn't allow the bolt to close on the guage.
Prices for all milurps have gone through the roof in the last 20 years or so. Still, if you get a good Lee-Enfield, No 1 or No 4, you have a great rifle. That springing action of the bolt is normal. The Lee-Enfield is the fastest bolt action there is. German troopies thought they were facing massed MG's during W. W. I when tangling with Brit and Canadian troops armed with a No. 1. Firing that fast takes some practice though.